From fb50f7ca7e10b616dc7e49625a9192aeb34fd126 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sun, 29 May 2022 11:36:00 -0400
Subject: [PATCH 01/48] Allow Updates by every actor on the same origin

---
 .../object_validators/update_validator.ex     |  4 +++-
 .../update_handling_test.exs                  | 24 ++++++++++++++++++-
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/object_validators/update_validator.ex b/lib/pleroma/web/activity_pub/object_validators/update_validator.ex
index a1fae47f5..2f0839c5b 100644
--- a/lib/pleroma/web/activity_pub/object_validators/update_validator.ex
+++ b/lib/pleroma/web/activity_pub/object_validators/update_validator.ex
@@ -51,7 +51,9 @@ def validate_updating_rights(cng) do
     with actor = get_field(cng, :actor),
          object = get_field(cng, :object),
          {:ok, object_id} <- ObjectValidators.ObjectID.cast(object),
-         true <- actor == object_id do
+         actor_uri <- URI.parse(actor),
+         object_uri <- URI.parse(object_id),
+         true <- actor_uri.host == object_uri.host do
       cng
     else
       _e ->
diff --git a/test/pleroma/web/activity_pub/object_validators/update_handling_test.exs b/test/pleroma/web/activity_pub/object_validators/update_handling_test.exs
index 15e4a82cd..4aed0239d 100644
--- a/test/pleroma/web/activity_pub/object_validators/update_handling_test.exs
+++ b/test/pleroma/web/activity_pub/object_validators/update_handling_test.exs
@@ -32,7 +32,7 @@ test "validates a basic object", %{valid_update: valid_update} do
     test "returns an error if the object can't be updated by the actor", %{
       valid_update: valid_update
     } do
-      other_user = insert(:user)
+      other_user = insert(:user, local: false)
 
       update =
         valid_update
@@ -40,5 +40,27 @@ test "returns an error if the object can't be updated by the actor", %{
 
       assert {:error, _cng} = ObjectValidator.validate(update, [])
     end
+
+    test "validates as long as the object is same-origin with the actor", %{
+      valid_update: valid_update
+    } do
+      other_user = insert(:user)
+
+      update =
+        valid_update
+        |> Map.put("actor", other_user.ap_id)
+
+      assert {:ok, _update, []} = ObjectValidator.validate(update, [])
+    end
+
+    test "validates if the object is not of an Actor type" do
+      note = insert(:note)
+      updated_note = note.data |> Map.put("content", "edited content")
+      other_user = insert(:user)
+
+      {:ok, update, _} = Builder.update(other_user, updated_note)
+
+      assert {:ok, _update, []} = ObjectValidator.validate(update, [])
+    end
   end
 end
-- 
2.43.0


From 9d9e765db224ecc4104a404c5e0e4a3247d74115 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sun, 29 May 2022 12:54:57 -0400
Subject: [PATCH 02/48] Handle Note and Question Updates

---
 lib/pleroma/web/activity_pub/side_effects.ex  | 82 ++++++++++++++++---
 .../web/activity_pub/side_effects_test.exs    | 23 ++++++
 2 files changed, 95 insertions(+), 10 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/side_effects.ex b/lib/pleroma/web/activity_pub/side_effects.ex
index 439268470..7617e6c97 100644
--- a/lib/pleroma/web/activity_pub/side_effects.ex
+++ b/lib/pleroma/web/activity_pub/side_effects.ex
@@ -150,23 +150,25 @@ def handle(
 
   # Tasks this handles:
   # - Update the user
+  # - Update a non-user object (Note, Question, etc.)
   #
   # For a local user, we also get a changeset with the full information, so we
   # can update non-federating, non-activitypub settings as well.
   @impl true
   def handle(%{data: %{"type" => "Update", "object" => updated_object}} = object, meta) do
-    if changeset = Keyword.get(meta, :user_update_changeset) do
-      changeset
-      |> User.update_and_set_cache()
+    updated_object_id = updated_object["id"]
+
+    with {_, true} <- {:has_id, is_binary(updated_object_id)},
+         {_, user} <- {:user, Pleroma.User.get_by_ap_id(updated_object_id)} do
+      if user do
+        handle_update_user(object, meta)
+      else
+        handle_update_object(object, meta)
+      end
     else
-      {:ok, new_user_data} = ActivityPub.user_data_from_user_object(updated_object)
-
-      User.get_by_ap_id(updated_object["id"])
-      |> User.remote_user_changeset(new_user_data)
-      |> User.update_and_set_cache()
+      _ ->
+        {:ok, object, meta}
     end
-
-    {:ok, object, meta}
   end
 
   # Tasks this handles:
@@ -395,6 +397,66 @@ def handle(object, meta) do
     {:ok, object, meta}
   end
 
+  defp handle_update_user(
+         %{data: %{"type" => "Update", "object" => updated_object}} = object,
+         meta
+       ) do
+    if changeset = Keyword.get(meta, :user_update_changeset) do
+      changeset
+      |> User.update_and_set_cache()
+    else
+      {:ok, new_user_data} = ActivityPub.user_data_from_user_object(updated_object)
+
+      User.get_by_ap_id(updated_object["id"])
+      |> User.remote_user_changeset(new_user_data)
+      |> User.update_and_set_cache()
+    end
+
+    {:ok, object, meta}
+  end
+
+  @updatable_object_types ["Note", "Question"]
+  # We do not allow poll options to be changed, but the poll description can be.
+  @updatable_fields [
+    "source",
+    "tag",
+    "updated",
+    "emoji",
+    "content",
+    "summary",
+    "sensitive",
+    "attachment",
+    "generator"
+  ]
+  defp handle_update_object(
+         %{data: %{"type" => "Update", "object" => updated_object}} = object,
+         meta
+       ) do
+    orig_object = Object.get_by_ap_id(updated_object["id"])
+    orig_object_data = orig_object.data
+
+    if orig_object_data["type"] in @updatable_object_types do
+      updated_object_data =
+        @updatable_fields
+        |> Enum.reduce(
+          orig_object_data,
+          fn field, acc ->
+            if Map.has_key?(updated_object, field) do
+              Map.put(acc, field, updated_object[field])
+            else
+              Map.drop(acc, [field])
+            end
+          end
+        )
+
+      orig_object
+      |> Object.change(%{data: updated_object_data})
+      |> Object.update_and_set_cache()
+    end
+
+    {:ok, object, meta}
+  end
+
   def handle_object_creation(%{"type" => "Question"} = object, activity, meta) do
     with {:ok, object, meta} <- Pipeline.common_pipeline(object, meta) do
       PollWorker.schedule_poll_end(activity)
diff --git a/test/pleroma/web/activity_pub/side_effects_test.exs b/test/pleroma/web/activity_pub/side_effects_test.exs
index e542c06f5..f30d016c8 100644
--- a/test/pleroma/web/activity_pub/side_effects_test.exs
+++ b/test/pleroma/web/activity_pub/side_effects_test.exs
@@ -145,6 +145,29 @@ test "it uses a given changeset to update", %{user: user, update: update} do
     end
   end
 
+  describe "update notes" do
+    setup do
+      user = insert(:user)
+      note = insert(:note, user: user)
+
+      updated_note =
+        note.data
+        |> Map.put("summary", "edited summary")
+        |> Map.put("content", "edited content")
+
+      {:ok, update_data, []} = Builder.update(user, updated_note)
+      {:ok, update, _meta} = ActivityPub.persist(update_data, local: true)
+
+      %{user: user, object_id: note.id, update_data: update_data, update: update}
+    end
+
+    test "it updates the note", %{object_id: object_id, update: update} do
+      {:ok, _, _} = SideEffects.handle(update)
+      new_note = Pleroma.Object.get_by_id(object_id)
+      assert %{"summary" => "edited summary", "content" => "edited content"} = new_note.data
+    end
+  end
+
   describe "EmojiReact objects" do
     setup do
       poster = insert(:user)
-- 
2.43.0


From 3563671e432a9e73c8ad86193231cacf6c86682e Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sun, 29 May 2022 13:54:16 -0400
Subject: [PATCH 03/48] Record edit history for Note and Question Updates

---
 lib/pleroma/web/activity_pub/side_effects.ex  | 34 +++++++++++++++++
 priv/static/schemas/litepub-0.1.jsonld        |  4 +-
 .../web/activity_pub/side_effects_test.exs    | 37 ++++++++++++++++++-
 3 files changed, 73 insertions(+), 2 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/side_effects.ex b/lib/pleroma/web/activity_pub/side_effects.ex
index 7617e6c97..1dcf0cf10 100644
--- a/lib/pleroma/web/activity_pub/side_effects.ex
+++ b/lib/pleroma/web/activity_pub/side_effects.ex
@@ -415,6 +415,26 @@ defp handle_update_user(
     {:ok, object, meta}
   end
 
+  defp history_for_object(object) do
+    with history <- Map.get(object, "formerRepresentations"),
+         true <- is_map(history),
+         "OrderedCollection" <- Map.get(history, "type"),
+         true <- is_list(Map.get(history, "orderedItems")),
+         true <- is_integer(Map.get(history, "totalItems")) do
+      history
+    else
+      _ -> history_skeleton()
+    end
+  end
+
+  defp history_skeleton do
+    %{
+      "type" => "OrderedCollection",
+      "totalItems" => 0,
+      "orderedItems" => []
+    }
+  end
+
   @updatable_object_types ["Note", "Question"]
   # We do not allow poll options to be changed, but the poll description can be.
   @updatable_fields [
@@ -436,6 +456,19 @@ defp handle_update_object(
     orig_object_data = orig_object.data
 
     if orig_object_data["type"] in @updatable_object_types do
+      # Put edit history
+      # Note that we may have got the edit history by first fetching the object
+      history = history_for_object(orig_object_data)
+
+      latest_history_item =
+        orig_object_data
+        |> Map.drop(["id", "formerRepresentations"])
+
+      new_history =
+        history
+        |> Map.put("orderedItems", [latest_history_item | history["orderedItems"]])
+        |> Map.put("totalItems", history["totalItems"] + 1)
+
       updated_object_data =
         @updatable_fields
         |> Enum.reduce(
@@ -448,6 +481,7 @@ defp handle_update_object(
             end
           end
         )
+        |> Map.put("formerRepresentations", new_history)
 
       orig_object
       |> Object.change(%{data: updated_object_data})
diff --git a/priv/static/schemas/litepub-0.1.jsonld b/priv/static/schemas/litepub-0.1.jsonld
index d2b62ba77..f582ed42c 100644
--- a/priv/static/schemas/litepub-0.1.jsonld
+++ b/priv/static/schemas/litepub-0.1.jsonld
@@ -39,7 +39,9 @@
             "alsoKnownAs": {
                 "@id": "as:alsoKnownAs",
                 "@type": "@id"
-            }
+            },
+            "vcard": "http://www.w3.org/2006/vcard/ns#",
+            "formerRepresentations": "litepub:formerRepresentations"
         }
     ]
 }
diff --git a/test/pleroma/web/activity_pub/side_effects_test.exs b/test/pleroma/web/activity_pub/side_effects_test.exs
index f30d016c8..a39a639b5 100644
--- a/test/pleroma/web/activity_pub/side_effects_test.exs
+++ b/test/pleroma/web/activity_pub/side_effects_test.exs
@@ -158,7 +158,7 @@ test "it uses a given changeset to update", %{user: user, update: update} do
       {:ok, update_data, []} = Builder.update(user, updated_note)
       {:ok, update, _meta} = ActivityPub.persist(update_data, local: true)
 
-      %{user: user, object_id: note.id, update_data: update_data, update: update}
+      %{user: user, note: note, object_id: note.id, update_data: update_data, update: update}
     end
 
     test "it updates the note", %{object_id: object_id, update: update} do
@@ -166,6 +166,41 @@ test "it updates the note", %{object_id: object_id, update: update} do
       new_note = Pleroma.Object.get_by_id(object_id)
       assert %{"summary" => "edited summary", "content" => "edited content"} = new_note.data
     end
+
+    test "it records the original note in formerRepresentations", %{
+      note: note,
+      object_id: object_id,
+      update: update
+    } do
+      {:ok, _, _} = SideEffects.handle(update)
+      %{data: new_note} = Pleroma.Object.get_by_id(object_id)
+      assert %{"summary" => "edited summary", "content" => "edited content"} = new_note
+
+      assert [Map.drop(note.data, ["id", "formerRepresentations"])] ==
+               new_note["formerRepresentations"]["orderedItems"]
+
+      assert new_note["formerRepresentations"]["totalItems"] == 1
+    end
+
+    test "it puts the original note at the front of formerRepresentations", %{
+      note: note,
+      object_id: object_id,
+      update: update
+    } do
+      {:ok, _, _} = SideEffects.handle(update)
+      %{data: first_edit} = Pleroma.Object.get_by_id(object_id)
+      {:ok, _, _} = SideEffects.handle(update)
+      %{data: new_note} = Pleroma.Object.get_by_id(object_id)
+      assert %{"summary" => "edited summary", "content" => "edited content"} = new_note
+
+      original_version = Map.drop(note.data, ["id", "formerRepresentations"])
+      first_edit = Map.drop(first_edit, ["id", "formerRepresentations"])
+
+      assert [first_edit, original_version] ==
+               new_note["formerRepresentations"]["orderedItems"]
+
+      assert new_note["formerRepresentations"]["totalItems"] == 2
+    end
   end
 
   describe "EmojiReact objects" do
-- 
2.43.0


From 1109acba2fe5d5bf66d248a43d5cdb07ce710de5 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sun, 29 May 2022 22:16:03 -0400
Subject: [PATCH 04/48] Allow updating polls

---
 lib/pleroma/web/activity_pub/side_effects.ex  | 81 ++++++++++++++-----
 .../web/activity_pub/side_effects_test.exs    | 64 ++++++++++++++-
 2 files changed, 125 insertions(+), 20 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/side_effects.ex b/lib/pleroma/web/activity_pub/side_effects.ex
index 1dcf0cf10..96a1b0336 100644
--- a/lib/pleroma/web/activity_pub/side_effects.ex
+++ b/lib/pleroma/web/activity_pub/side_effects.ex
@@ -448,14 +448,29 @@ defp history_skeleton do
     "attachment",
     "generator"
   ]
-  defp handle_update_object(
-         %{data: %{"type" => "Update", "object" => updated_object}} = object,
-         meta
-       ) do
-    orig_object = Object.get_by_ap_id(updated_object["id"])
-    orig_object_data = orig_object.data
+  defp update_content_fields(orig_object_data, updated_object) do
+    @updatable_fields
+    |> Enum.reduce(
+      %{data: orig_object_data, updated: false},
+      fn field, %{data: data, updated: updated} ->
+        updated = updated or Map.get(updated_object, field) != Map.get(orig_object_data, field)
 
-    if orig_object_data["type"] in @updatable_object_types do
+        data =
+          if Map.has_key?(updated_object, field) do
+            Map.put(data, field, updated_object[field])
+          else
+            Map.drop(data, [field])
+          end
+
+        %{data: data, updated: updated}
+      end
+    )
+  end
+
+  defp maybe_update_history(updated_object, orig_object_data, updated) do
+    if not updated do
+      updated_object
+    else
       # Put edit history
       # Note that we may have got the edit history by first fetching the object
       history = history_for_object(orig_object_data)
@@ -469,19 +484,47 @@ defp handle_update_object(
         |> Map.put("orderedItems", [latest_history_item | history["orderedItems"]])
         |> Map.put("totalItems", history["totalItems"] + 1)
 
+      updated_object
+      |> Map.put("formerRepresentations", new_history)
+    end
+  end
+
+  defp maybe_update_poll(to_be_updated, updated_object) do
+    choice_key = fn data ->
+      if Map.has_key?(data, "anyOf"), do: "anyOf", else: "oneOf"
+    end
+
+    with true <- to_be_updated["type"] == "Question",
+         key <- choice_key.(updated_object),
+         true <- key == choice_key.(to_be_updated),
+         orig_choices <- to_be_updated[key] |> Enum.map(&Map.drop(&1, ["replies"])),
+         new_choices <- updated_object[key] |> Enum.map(&Map.drop(&1, ["replies"])),
+         true <- orig_choices == new_choices do
+      # Choices are the same, but counts are different
+      to_be_updated
+      |> Map.put(key, updated_object[key])
+    else
+      # Choices (or vote type) have changed, do not allow this
+      _ -> to_be_updated
+    end
+  end
+
+  defp handle_update_object(
+         %{data: %{"type" => "Update", "object" => updated_object}} = object,
+         meta
+       ) do
+    orig_object = Object.get_by_ap_id(updated_object["id"])
+    orig_object_data = orig_object.data
+
+    if orig_object_data["type"] in @updatable_object_types do
+      %{data: updated_object_data, updated: updated} =
+        orig_object_data
+        |> update_content_fields(updated_object)
+
       updated_object_data =
-        @updatable_fields
-        |> Enum.reduce(
-          orig_object_data,
-          fn field, acc ->
-            if Map.has_key?(updated_object, field) do
-              Map.put(acc, field, updated_object[field])
-            else
-              Map.drop(acc, [field])
-            end
-          end
-        )
-        |> Map.put("formerRepresentations", new_history)
+        updated_object_data
+        |> maybe_update_history(orig_object_data, updated)
+        |> maybe_update_poll(updated_object)
 
       orig_object
       |> Object.change(%{data: updated_object_data})
diff --git a/test/pleroma/web/activity_pub/side_effects_test.exs b/test/pleroma/web/activity_pub/side_effects_test.exs
index a39a639b5..c2b923f1c 100644
--- a/test/pleroma/web/activity_pub/side_effects_test.exs
+++ b/test/pleroma/web/activity_pub/side_effects_test.exs
@@ -183,15 +183,24 @@ test "it records the original note in formerRepresentations", %{
     end
 
     test "it puts the original note at the front of formerRepresentations", %{
+      user: user,
       note: note,
       object_id: object_id,
       update: update
     } do
       {:ok, _, _} = SideEffects.handle(update)
       %{data: first_edit} = Pleroma.Object.get_by_id(object_id)
+
+      second_updated_note =
+        note.data
+        |> Map.put("summary", "edited summary 2")
+        |> Map.put("content", "edited content 2")
+
+      {:ok, second_update_data, []} = Builder.update(user, second_updated_note)
+      {:ok, update, _meta} = ActivityPub.persist(second_update_data, local: true)
       {:ok, _, _} = SideEffects.handle(update)
       %{data: new_note} = Pleroma.Object.get_by_id(object_id)
-      assert %{"summary" => "edited summary", "content" => "edited content"} = new_note
+      assert %{"summary" => "edited summary 2", "content" => "edited content 2"} = new_note
 
       original_version = Map.drop(note.data, ["id", "formerRepresentations"])
       first_edit = Map.drop(first_edit, ["id", "formerRepresentations"])
@@ -201,6 +210,59 @@ test "it puts the original note at the front of formerRepresentations", %{
 
       assert new_note["formerRepresentations"]["totalItems"] == 2
     end
+
+    test "it does not prepend to formerRepresentations if no actual changes are made", %{
+      note: note,
+      object_id: object_id,
+      update: update
+    } do
+      {:ok, _, _} = SideEffects.handle(update)
+      %{data: _first_edit} = Pleroma.Object.get_by_id(object_id)
+
+      {:ok, _, _} = SideEffects.handle(update)
+      %{data: new_note} = Pleroma.Object.get_by_id(object_id)
+      assert %{"summary" => "edited summary", "content" => "edited content"} = new_note
+
+      original_version = Map.drop(note.data, ["id", "formerRepresentations"])
+
+      assert [original_version] ==
+               new_note["formerRepresentations"]["orderedItems"]
+
+      assert new_note["formerRepresentations"]["totalItems"] == 1
+    end
+  end
+
+  describe "update questions" do
+    setup do
+      user = insert(:user)
+      question = insert(:question, user: user)
+
+      %{user: user, data: question.data, id: question.id}
+    end
+
+    test "allows updating choice count without generating edit history", %{
+      user: user,
+      data: data,
+      id: id
+    } do
+      new_choices =
+        data["oneOf"]
+        |> Enum.map(fn choice -> put_in(choice, ["replies", "totalItems"], 5) end)
+
+      updated_question = data |> Map.put("oneOf", new_choices)
+
+      {:ok, update_data, []} = Builder.update(user, updated_question)
+      {:ok, update, _meta} = ActivityPub.persist(update_data, local: true)
+
+      {:ok, _, _} = SideEffects.handle(update)
+
+      %{data: new_question} = Pleroma.Object.get_by_id(id)
+
+      assert [%{"replies" => %{"totalItems" => 5}}, %{"replies" => %{"totalItems" => 5}}] =
+               new_question["oneOf"]
+
+      refute Map.has_key?(new_question, "formerRepresentations")
+    end
   end
 
   describe "EmojiReact objects" do
-- 
2.43.0


From bc54d06588775b39de5d2b2c7f1a431b9cd00df9 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sun, 29 May 2022 23:50:31 -0400
Subject: [PATCH 05/48] Implement mastodon api for showing edit history

---
 lib/pleroma/object.ex                         | 20 +++++
 lib/pleroma/web/activity_pub/side_effects.ex  | 22 +----
 .../api_spec/operations/status_operation.ex   | 82 +++++++++++++++++++
 .../controllers/status_controller.ex          | 30 ++++++-
 .../web/mastodon_api/views/status_view.ex     | 65 +++++++++++++++
 lib/pleroma/web/router.ex                     |  3 +
 .../controllers/status_controller_test.exs    | 46 +++++++++++
 7 files changed, 245 insertions(+), 23 deletions(-)

diff --git a/lib/pleroma/object.ex b/lib/pleroma/object.ex
index c3ea1b98b..4eb337236 100644
--- a/lib/pleroma/object.ex
+++ b/lib/pleroma/object.ex
@@ -425,4 +425,24 @@ def object_data_hashtags(%{"tag" => tags}) when is_list(tags) do
   end
 
   def object_data_hashtags(_), do: []
+
+  def history_for(object) do
+    with history <- Map.get(object, "formerRepresentations"),
+         true <- is_map(history),
+         "OrderedCollection" <- Map.get(history, "type"),
+         true <- is_list(Map.get(history, "orderedItems")),
+         true <- is_integer(Map.get(history, "totalItems")) do
+      history
+    else
+      _ -> history_skeleton()
+    end
+  end
+
+  defp history_skeleton do
+    %{
+      "type" => "OrderedCollection",
+      "totalItems" => 0,
+      "orderedItems" => []
+    }
+  end
 end
diff --git a/lib/pleroma/web/activity_pub/side_effects.ex b/lib/pleroma/web/activity_pub/side_effects.ex
index 96a1b0336..2266068e3 100644
--- a/lib/pleroma/web/activity_pub/side_effects.ex
+++ b/lib/pleroma/web/activity_pub/side_effects.ex
@@ -415,26 +415,6 @@ defp handle_update_user(
     {:ok, object, meta}
   end
 
-  defp history_for_object(object) do
-    with history <- Map.get(object, "formerRepresentations"),
-         true <- is_map(history),
-         "OrderedCollection" <- Map.get(history, "type"),
-         true <- is_list(Map.get(history, "orderedItems")),
-         true <- is_integer(Map.get(history, "totalItems")) do
-      history
-    else
-      _ -> history_skeleton()
-    end
-  end
-
-  defp history_skeleton do
-    %{
-      "type" => "OrderedCollection",
-      "totalItems" => 0,
-      "orderedItems" => []
-    }
-  end
-
   @updatable_object_types ["Note", "Question"]
   # We do not allow poll options to be changed, but the poll description can be.
   @updatable_fields [
@@ -473,7 +453,7 @@ defp maybe_update_history(updated_object, orig_object_data, updated) do
     else
       # Put edit history
       # Note that we may have got the edit history by first fetching the object
-      history = history_for_object(orig_object_data)
+      history = Object.history_for(orig_object_data)
 
       latest_history_item =
         orig_object_data
diff --git a/lib/pleroma/web/api_spec/operations/status_operation.ex b/lib/pleroma/web/api_spec/operations/status_operation.ex
index a5da8b58e..33cb456e7 100644
--- a/lib/pleroma/web/api_spec/operations/status_operation.ex
+++ b/lib/pleroma/web/api_spec/operations/status_operation.ex
@@ -6,9 +6,13 @@ defmodule Pleroma.Web.ApiSpec.StatusOperation do
   alias OpenApiSpex.Operation
   alias OpenApiSpex.Schema
   alias Pleroma.Web.ApiSpec.AccountOperation
+  alias Pleroma.Web.ApiSpec.Schemas.Account
   alias Pleroma.Web.ApiSpec.Schemas.ApiError
+  alias Pleroma.Web.ApiSpec.Schemas.Attachment
   alias Pleroma.Web.ApiSpec.Schemas.BooleanLike
+  alias Pleroma.Web.ApiSpec.Schemas.Emoji
   alias Pleroma.Web.ApiSpec.Schemas.FlakeID
+  alias Pleroma.Web.ApiSpec.Schemas.Poll
   alias Pleroma.Web.ApiSpec.Schemas.ScheduledStatus
   alias Pleroma.Web.ApiSpec.Schemas.Status
   alias Pleroma.Web.ApiSpec.Schemas.VisibilityScope
@@ -406,6 +410,29 @@ def bookmarks_operation do
     }
   end
 
+  def show_history_operation do
+    %Operation{
+      tags: ["Retrieve status history"],
+      summary: "Status history",
+      description: "View history of a status",
+      operationId: "StatusController.show_history",
+      security: [%{"oAuth" => ["read:statuses"]}],
+      parameters: [
+        id_param()
+      ],
+      responses: %{
+        200 => status_history_response(),
+        404 => Operation.response("Not Found", "application/json", ApiError)
+      }
+    }
+  end
+
+  def show_source_operation do
+  end
+
+  def update_operation do
+  end
+
   def array_of_statuses do
     %Schema{type: :array, items: Status, example: [Status.schema().example]}
   end
@@ -556,6 +583,61 @@ defp status_response do
     Operation.response("Status", "application/json", Status)
   end
 
+  defp status_history_response do
+    Operation.response(
+      "Status History",
+      "application/json",
+      %Schema{
+        title: "Status history",
+        description: "Response schema for history of a status",
+        type: :array,
+        items: %Schema{
+          type: :object,
+          properties: %{
+            account: %Schema{
+              allOf: [Account],
+              description: "The account that authored this status"
+            },
+            content: %Schema{
+              type: :string,
+              format: :html,
+              description: "HTML-encoded status content"
+            },
+            sensitive: %Schema{
+              type: :boolean,
+              description: "Is this status marked as sensitive content?"
+            },
+            spoiler_text: %Schema{
+              type: :string,
+              description:
+                "Subject or summary line, below which status content is collapsed until expanded"
+            },
+            created_at: %Schema{
+              type: :string,
+              format: "date-time",
+              description: "The date when this status was created"
+            },
+            media_attachments: %Schema{
+              type: :array,
+              items: Attachment,
+              description: "Media that is attached to this status"
+            },
+            emojis: %Schema{
+              type: :array,
+              items: Emoji,
+              description: "Custom emoji to be used when rendering status content"
+            },
+            poll: %Schema{
+              allOf: [Poll],
+              nullable: true,
+              description: "The poll attached to the status"
+            }
+          }
+        }
+      }
+    )
+  end
+
   defp context do
     %Schema{
       title: "StatusContext",
diff --git a/lib/pleroma/web/mastodon_api/controllers/status_controller.ex b/lib/pleroma/web/mastodon_api/controllers/status_controller.ex
index 9ab30742b..458a3ba98 100644
--- a/lib/pleroma/web/mastodon_api/controllers/status_controller.ex
+++ b/lib/pleroma/web/mastodon_api/controllers/status_controller.ex
@@ -37,7 +37,9 @@ defmodule Pleroma.Web.MastodonAPI.StatusController do
     when action in [
            :index,
            :show,
-           :context
+           :context,
+           :show_history,
+           :show_source
          ]
   )
 
@@ -48,7 +50,8 @@ defmodule Pleroma.Web.MastodonAPI.StatusController do
            :create,
            :delete,
            :reblog,
-           :unreblog
+           :unreblog,
+           :update
          ]
   )
 
@@ -190,6 +193,29 @@ def create(%{assigns: %{user: _user}, body_params: %{media_ids: _} = params} = c
     create(%Plug.Conn{conn | body_params: params}, %{})
   end
 
+  @doc "GET /api/v1/statuses/:id/history"
+  def show_history(%{assigns: %{user: user}} = conn, %{id: id} = params) do
+    with %Activity{} = activity <- Activity.get_by_id_with_object(id),
+         true <- Visibility.visible_for_user?(activity, user) do
+      try_render(conn, "history.json",
+        activity: activity,
+        for: user,
+        with_direct_conversation_id: true,
+        with_muted: Map.get(params, :with_muted, false)
+      )
+    else
+      _ -> {:error, :not_found}
+    end
+  end
+
+  @doc "GET /api/v1/statuses/:id/source"
+  def show_source(%{assigns: %{user: _user}} = _conn, %{id: _id} = _params) do
+  end
+
+  @doc "PUT /api/v1/statuses/:id"
+  def update(%{assigns: %{user: _user}} = _conn, %{id: _id} = _params) do
+  end
+
   @doc "GET /api/v1/statuses/:id"
   def show(%{assigns: %{user: user}} = conn, %{id: id} = params) do
     with %Activity{} = activity <- Activity.get_by_id_with_object(id),
diff --git a/lib/pleroma/web/mastodon_api/views/status_view.ex b/lib/pleroma/web/mastodon_api/views/status_view.ex
index cf4ea51e0..db7087ad5 100644
--- a/lib/pleroma/web/mastodon_api/views/status_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/status_view.ex
@@ -390,6 +390,71 @@ def render("show.json", _) do
     nil
   end
 
+  def render("history.json", %{activity: %{data: %{"object" => _object}} = activity} = opts) do
+    object = Object.normalize(activity, fetch: false)
+
+    hashtags = Object.hashtags(object)
+
+    user = CommonAPI.get_user(activity.data["actor"])
+
+    past_history =
+      Object.history_for(object.data)
+      |> Map.get("orderedItems")
+      |> Enum.map(&Map.put(&1, "id", object.data["id"]))
+      |> Enum.map(&%Object{data: &1, id: object.id})
+
+    history = [object | past_history]
+
+    individual_opts =
+      opts
+      |> Map.put(:as, :object)
+      |> Map.put(:user, user)
+      |> Map.put(:hashtags, hashtags)
+
+    render_many(history, StatusView, "history_item.json", individual_opts)
+  end
+
+  def render(
+        "history_item.json",
+        %{activity: activity, user: user, object: object, hashtags: hashtags} = opts
+      ) do
+    sensitive = object.data["sensitive"] || Enum.member?(hashtags, "nsfw")
+
+    attachment_data = object.data["attachment"] || []
+    attachments = render_many(attachment_data, StatusView, "attachment.json", as: :attachment)
+
+    created_at = Utils.to_masto_date(object.data["updated"] || object.data["published"])
+
+    content =
+      object
+      |> render_content()
+
+    content_html =
+      content
+      |> Activity.HTML.get_cached_scrubbed_html_for_activity(
+        User.html_filter_policy(opts[:for]),
+        activity,
+        "mastoapi:content"
+      )
+
+    summary = object.data["summary"] || ""
+
+    %{
+      account:
+        AccountView.render("show.json", %{
+          user: user,
+          for: opts[:for]
+        }),
+      content: content_html,
+      sensitive: sensitive,
+      spoiler_text: summary,
+      created_at: created_at,
+      media_attachments: attachments,
+      emojis: build_emojis(object.data["emoji"]),
+      poll: render(PollView, "show.json", object: object, for: opts[:for])
+    }
+  end
+
   def render("card.json", %{rich_media: rich_media, page_url: page_url}) do
     page_url_data = URI.parse(page_url)
 
diff --git a/lib/pleroma/web/router.ex b/lib/pleroma/web/router.ex
index a0310bbb5..81fbc9f6f 100644
--- a/lib/pleroma/web/router.ex
+++ b/lib/pleroma/web/router.ex
@@ -537,6 +537,9 @@ defmodule Pleroma.Web.Router do
     get("/bookmarks", StatusController, :bookmarks)
 
     post("/statuses", StatusController, :create)
+    get("/statuses/:id/history", StatusController, :show_history)
+    get("/statuses/:id/source", StatusController, :show_source)
+    put("/statuses/:id", StatusController, :update)
     delete("/statuses/:id", StatusController, :delete)
     post("/statuses/:id/reblog", StatusController, :reblog)
     post("/statuses/:id/unreblog", StatusController, :unreblog)
diff --git a/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs b/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
index b0efddb2a..8d25da7e7 100644
--- a/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
+++ b/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
@@ -2040,6 +2040,52 @@ test "posting a quote of a status that doesn't exist", %{conn: conn} do
                  "quote_id" => "oops"
                })
                |> json_response_and_validate_schema(422)
+	end
+  end
+
+  describe "get status history" do
+    setup do
+      oauth_access(["read:statuses"])
+    end
+
+    test "unedited post", %{conn: conn} do
+      activity = insert(:note_activity)
+
+      conn = get(conn, "/api/v1/statuses/#{activity.id}/history")
+
+      assert [_] = json_response_and_validate_schema(conn, 200)
+    end
+
+    test "edited post", %{conn: conn} do
+      note =
+        insert(
+          :note,
+          data: %{
+            "formerRepresentations" => %{
+              "type" => "OrderedCollection",
+              "orderedItems" => [
+                %{
+                  "type" => "Note",
+                  "content" => "mew mew 2",
+                  "summary" => "title 2"
+                },
+                %{
+                  "type" => "Note",
+                  "content" => "mew mew 1",
+                  "summary" => "title 1"
+                }
+              ],
+              "totalItems" => 2
+            }
+          }
+        )
+
+      activity = insert(:note_activity, note: note)
+
+      conn = get(conn, "/api/v1/statuses/#{activity.id}/history")
+
+      assert [_, %{"spoiler_text" => "title 2"}, %{"spoiler_text" => "title 1"}] =
+               json_response_and_validate_schema(conn, 200)
     end
   end
 end
-- 
2.43.0


From f269e910ef5ff743105b7a6cb9240e5428edb8ef Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Mon, 30 May 2022 00:59:23 -0400
Subject: [PATCH 06/48] Implement viewing source

---
 .../api_spec/operations/status_operation.ex   | 36 +++++++++++++++++++
 .../controllers/status_controller.ex          | 11 +++++-
 .../web/mastodon_api/views/status_view.ex     | 10 ++++++
 .../controllers/status_controller_test.exs    | 18 ++++++++++
 4 files changed, 74 insertions(+), 1 deletion(-)

diff --git a/lib/pleroma/web/api_spec/operations/status_operation.ex b/lib/pleroma/web/api_spec/operations/status_operation.ex
index 33cb456e7..d84fdccb8 100644
--- a/lib/pleroma/web/api_spec/operations/status_operation.ex
+++ b/lib/pleroma/web/api_spec/operations/status_operation.ex
@@ -428,6 +428,20 @@ def show_history_operation do
   end
 
   def show_source_operation do
+    %Operation{
+      tags: ["Retrieve status source"],
+      summary: "Status source",
+      description: "View source of a status",
+      operationId: "StatusController.show_source",
+      security: [%{"oAuth" => ["read:statuses"]}],
+      parameters: [
+        id_param()
+      ],
+      responses: %{
+        200 => status_source_response(),
+        404 => Operation.response("Not Found", "application/json", ApiError)
+      }
+    }
   end
 
   def update_operation do
@@ -638,6 +652,28 @@ defp status_history_response do
     )
   end
 
+  defp status_source_response do
+    Operation.response(
+      "Status Source",
+      "application/json",
+      %Schema{
+        type: :object,
+        properties: %{
+          id: FlakeID,
+          text: %Schema{
+            type: :string,
+            description: "Raw source of status content"
+          },
+          spoiler_text: %Schema{
+            type: :string,
+            description:
+            "Subject or summary line, below which status content is collapsed until expanded"
+          }
+        }
+      }
+    )
+  end
+
   defp context do
     %Schema{
       title: "StatusContext",
diff --git a/lib/pleroma/web/mastodon_api/controllers/status_controller.ex b/lib/pleroma/web/mastodon_api/controllers/status_controller.ex
index 458a3ba98..e783b9057 100644
--- a/lib/pleroma/web/mastodon_api/controllers/status_controller.ex
+++ b/lib/pleroma/web/mastodon_api/controllers/status_controller.ex
@@ -209,7 +209,16 @@ def show_history(%{assigns: %{user: user}} = conn, %{id: id} = params) do
   end
 
   @doc "GET /api/v1/statuses/:id/source"
-  def show_source(%{assigns: %{user: _user}} = _conn, %{id: _id} = _params) do
+  def show_source(%{assigns: %{user: user}} = conn, %{id: id} = _params) do
+    with %Activity{} = activity <- Activity.get_by_id_with_object(id),
+         true <- Visibility.visible_for_user?(activity, user) do
+      try_render(conn, "source.json",
+        activity: activity,
+        for: user
+      )
+    else
+      _ -> {:error, :not_found}
+    end
   end
 
   @doc "PUT /api/v1/statuses/:id"
diff --git a/lib/pleroma/web/mastodon_api/views/status_view.ex b/lib/pleroma/web/mastodon_api/views/status_view.ex
index db7087ad5..3718d0e40 100644
--- a/lib/pleroma/web/mastodon_api/views/status_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/status_view.ex
@@ -455,6 +455,16 @@ def render(
     }
   end
 
+  def render("source.json", %{activity: %{data: %{"object" => _object}} = activity} = _opts) do
+    object = Object.normalize(activity, fetch: false)
+
+    %{
+      id: activity.id,
+      text: Map.get(object.data, "source", ""),
+      spoiler_text: Map.get(object.data, "summary", "")
+    }
+  end
+
   def render("card.json", %{rich_media: rich_media, page_url: page_url}) do
     page_url_data = URI.parse(page_url)
 
diff --git a/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs b/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
index 8d25da7e7..c2104e099 100644
--- a/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
+++ b/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
@@ -2088,4 +2088,22 @@ test "edited post", %{conn: conn} do
                json_response_and_validate_schema(conn, 200)
     end
   end
+
+  describe "get status source" do
+    setup do
+      oauth_access(["read:statuses"])
+    end
+
+    test "it returns the source", %{conn: conn} do
+      user = insert(:user)
+
+      {:ok, activity} = CommonAPI.post(user, %{status: "mew mew #abc", spoiler_text: "#def"})
+
+      conn = get(conn, "/api/v1/statuses/#{activity.id}/source")
+
+      id = activity.id
+
+      assert %{"id" => ^id, "text" => "mew mew #abc", "spoiler_text" => "#def"} = json_response_and_validate_schema(conn, 200)
+    end
+  end
 end
-- 
2.43.0


From e6ab68c62420c0ff608f8e36815de11b169e7a09 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Tue, 31 May 2022 14:29:12 -0400
Subject: [PATCH 07/48] Implement mastodon api for editing status

---
 lib/pleroma/constants.ex                      | 24 ++++++
 lib/pleroma/web/activity_pub/builder.ex       | 13 ++-
 lib/pleroma/web/activity_pub/side_effects.ex  | 16 +---
 .../api_spec/operations/status_operation.ex   | 72 ++++++++++++++++-
 lib/pleroma/web/common_api.ex                 | 36 +++++++++
 .../controllers/status_controller.ex          | 21 ++++-
 test/pleroma/web/common_api_test.exs          | 29 +++++++
 .../controllers/status_controller_test.exs    | 79 ++++++++++++++++++-
 8 files changed, 271 insertions(+), 19 deletions(-)

diff --git a/lib/pleroma/constants.ex b/lib/pleroma/constants.ex
index bf92f65cb..e65dd2f77 100644
--- a/lib/pleroma/constants.ex
+++ b/lib/pleroma/constants.ex
@@ -27,4 +27,28 @@ defmodule Pleroma.Constants do
     do:
       ~w(index.html robots.txt static static-fe finmoji emoji packs sounds images instance sw.js sw-pleroma.js favicon.png schemas doc embed.js embed.css)
   )
+
+  const(status_updatable_fields,
+    do: [
+      "source",
+      "tag",
+      "updated",
+      "emoji",
+      "content",
+      "summary",
+      "sensitive",
+      "attachment",
+      "generator"
+    ]
+  )
+
+  const(actor_types,
+    do: [
+      "Application",
+      "Group",
+      "Organization",
+      "Person",
+      "Service"
+    ]
+  )
 end
diff --git a/lib/pleroma/web/activity_pub/builder.ex b/lib/pleroma/web/activity_pub/builder.ex
index 97ceaf08e..ca08d3837 100644
--- a/lib/pleroma/web/activity_pub/builder.ex
+++ b/lib/pleroma/web/activity_pub/builder.ex
@@ -231,10 +231,16 @@ def like(actor, object) do
     end
   end
 
-  # Retricted to user updates for now, always public
   @spec update(User.t(), Object.t()) :: {:ok, map(), keyword()}
   def update(actor, object) do
-    to = [Pleroma.Constants.as_public(), actor.follower_address]
+    {to, cc} =
+      if object["type"] in Pleroma.Constants.actor_types() do
+        # User updates, always public
+        {[Pleroma.Constants.as_public(), actor.follower_address], []}
+      else
+        # Status updates, follow the recipients in the object
+        {object["to"] || [], object["cc"] || []}
+      end
 
     {:ok,
      %{
@@ -242,7 +248,8 @@ def update(actor, object) do
        "type" => "Update",
        "actor" => actor.ap_id,
        "object" => object,
-       "to" => to
+       "to" => to,
+       "cc" => cc
      }, []}
   end
 
diff --git a/lib/pleroma/web/activity_pub/side_effects.ex b/lib/pleroma/web/activity_pub/side_effects.ex
index 2266068e3..f3ddaacdd 100644
--- a/lib/pleroma/web/activity_pub/side_effects.ex
+++ b/lib/pleroma/web/activity_pub/side_effects.ex
@@ -23,6 +23,7 @@ defmodule Pleroma.Web.ActivityPub.SideEffects do
   alias Pleroma.Web.Streamer
   alias Pleroma.Workers.PollWorker
 
+  require Pleroma.Constants
   require Logger
 
   @logger Pleroma.Config.get([:side_effects, :logger], Logger)
@@ -416,20 +417,8 @@ defp handle_update_user(
   end
 
   @updatable_object_types ["Note", "Question"]
-  # We do not allow poll options to be changed, but the poll description can be.
-  @updatable_fields [
-    "source",
-    "tag",
-    "updated",
-    "emoji",
-    "content",
-    "summary",
-    "sensitive",
-    "attachment",
-    "generator"
-  ]
   defp update_content_fields(orig_object_data, updated_object) do
-    @updatable_fields
+    Pleroma.Constants.status_updatable_fields()
     |> Enum.reduce(
       %{data: orig_object_data, updated: false},
       fn field, %{data: data, updated: updated} ->
@@ -507,6 +496,7 @@ defp handle_update_object(
         |> maybe_update_poll(updated_object)
 
       orig_object
+      |> Repo.preload(:hashtags)
       |> Object.change(%{data: updated_object_data})
       |> Object.update_and_set_cache()
     end
diff --git a/lib/pleroma/web/api_spec/operations/status_operation.ex b/lib/pleroma/web/api_spec/operations/status_operation.ex
index d84fdccb8..2f556f3b6 100644
--- a/lib/pleroma/web/api_spec/operations/status_operation.ex
+++ b/lib/pleroma/web/api_spec/operations/status_operation.ex
@@ -445,6 +445,22 @@ def show_source_operation do
   end
 
   def update_operation do
+    %Operation{
+      tags: ["Update status"],
+      summary: "Update status",
+      description: "Change the content of a status",
+      operationId: "StatusController.update",
+      security: [%{"oAuth" => ["write:statuses"]}],
+      parameters: [
+        id_param()
+      ],
+      requestBody: request_body("Parameters", update_request(), required: true),
+      responses: %{
+        200 => status_response(),
+        403 => Operation.response("Forbidden", "application/json", ApiError),
+        404 => Operation.response("Not Found", "application/json", ApiError)
+      }
+    }
   end
 
   def array_of_statuses do
@@ -555,6 +571,60 @@ defp create_request do
     }
   end
 
+  defp update_request do
+    %Schema{
+      title: "StatusUpdateRequest",
+      type: :object,
+      properties: %{
+        status: %Schema{
+          type: :string,
+          nullable: true,
+          description:
+            "Text content of the status. If `media_ids` is provided, this becomes optional. Attaching a `poll` is optional while `status` is provided."
+        },
+        media_ids: %Schema{
+          nullable: true,
+          type: :array,
+          items: %Schema{type: :string},
+          description: "Array of Attachment ids to be attached as media."
+        },
+        poll: poll_params(),
+        sensitive: %Schema{
+          allOf: [BooleanLike],
+          nullable: true,
+          description: "Mark status and attached media as sensitive?"
+        },
+        spoiler_text: %Schema{
+          type: :string,
+          nullable: true,
+          description:
+            "Text to be shown as a warning or subject before the actual content. Statuses are generally collapsed behind this field."
+        },
+        content_type: %Schema{
+          type: :string,
+          nullable: true,
+          description:
+            "The MIME type of the status, it is transformed into HTML by the backend. You can get the list of the supported MIME types with the nodeinfo endpoint."
+        },
+        to: %Schema{
+          type: :array,
+          nullable: true,
+          items: %Schema{type: :string},
+          description:
+            "A list of nicknames (like `lain@soykaf.club` or `lain` on the local server) that will be used to determine who is going to be addressed by this post. Using this will disable the implicit addressing by mentioned names in the `status` body, only the people in the `to` list will be addressed. The normal rules for for post visibility are not affected by this and will still apply"
+        }
+      },
+      example: %{
+        "status" => "What time is it?",
+        "sensitive" => "false",
+        "poll" => %{
+          "options" => ["Cofe", "Adventure"],
+          "expires_in" => 420
+        }
+      }
+    }
+  end
+
   def poll_params do
     %Schema{
       nullable: true,
@@ -667,7 +737,7 @@ defp status_source_response do
           spoiler_text: %Schema{
             type: :string,
             description:
-            "Subject or summary line, below which status content is collapsed until expanded"
+              "Subject or summary line, below which status content is collapsed until expanded"
           }
         }
       }
diff --git a/lib/pleroma/web/common_api.ex b/lib/pleroma/web/common_api.ex
index bc5e26cf7..b2a559455 100644
--- a/lib/pleroma/web/common_api.ex
+++ b/lib/pleroma/web/common_api.ex
@@ -346,6 +346,42 @@ def post(user, %{status: _} = data) do
     end
   end
 
+  def update(user, orig_activity, changes) do
+    with orig_object <- Object.normalize(orig_activity),
+         {:ok, new_object} <- make_update_data(user, orig_object, changes),
+         {:ok, update_data, _} <- Builder.update(user, new_object),
+         {:ok, update, _} <- Pipeline.common_pipeline(update_data, local: true) do
+      {:ok, update}
+    else
+      _ -> {:error, nil}
+    end
+  end
+
+  defp make_update_data(user, orig_object, changes) do
+    kept_params = %{
+      visibility: Visibility.get_visibility(orig_object)
+    }
+
+    params = Map.merge(changes, kept_params)
+
+    with {:ok, draft} <- ActivityDraft.create(user, params) do
+      change =
+        Pleroma.Constants.status_updatable_fields()
+        |> Enum.reduce(orig_object.data, fn key, acc ->
+          if Map.has_key?(draft.object, key) do
+            acc |> Map.put(key, Map.get(draft.object, key))
+          else
+            acc |> Map.drop([key])
+          end
+        end)
+        |> Map.put("updated", Utils.make_date())
+
+      {:ok, change}
+    else
+      _ -> {:error, nil}
+    end
+  end
+
   @spec pin(String.t(), User.t()) :: {:ok, Activity.t()} | {:error, term()}
   def pin(id, %User{} = user) do
     with %Activity{} = activity <- create_activity_by_id(id),
diff --git a/lib/pleroma/web/mastodon_api/controllers/status_controller.ex b/lib/pleroma/web/mastodon_api/controllers/status_controller.ex
index e783b9057..648e7bad6 100644
--- a/lib/pleroma/web/mastodon_api/controllers/status_controller.ex
+++ b/lib/pleroma/web/mastodon_api/controllers/status_controller.ex
@@ -222,7 +222,26 @@ def show_source(%{assigns: %{user: user}} = conn, %{id: id} = _params) do
   end
 
   @doc "PUT /api/v1/statuses/:id"
-  def update(%{assigns: %{user: _user}} = _conn, %{id: _id} = _params) do
+  def update(%{assigns: %{user: user}, body_params: body_params} = conn, %{id: id} = params) do
+    with {_, %Activity{}} = {_, activity} <- {:activity, Activity.get_by_id_with_object(id)},
+         {_, true} <- {:visible, Visibility.visible_for_user?(activity, user)},
+         {_, true} <- {:is_create, activity.data["type"] == "Create"},
+         actor <- Activity.user_actor(activity),
+         {_, true} <- {:own_status, actor.id == user.id},
+         changes <- body_params |> put_application(conn),
+         {_, {:ok, _update_activity}} <- {:pipeline, CommonAPI.update(user, activity, changes)},
+         {_, %Activity{}} = {_, activity} <- {:refetched, Activity.get_by_id_with_object(id)} do
+      try_render(conn, "show.json",
+        activity: activity,
+        for: user,
+        with_direct_conversation_id: true,
+        with_muted: Map.get(params, :with_muted, false)
+      )
+    else
+      {:own_status, _} -> {:error, :forbidden}
+      {:pipeline, _} -> {:error, :internal_server_error}
+      _ -> {:error, :not_found}
+    end
   end
 
   @doc "GET /api/v1/statuses/:id"
diff --git a/test/pleroma/web/common_api_test.exs b/test/pleroma/web/common_api_test.exs
index fa751bf60..9c43f7ea8 100644
--- a/test/pleroma/web/common_api_test.exs
+++ b/test/pleroma/web/common_api_test.exs
@@ -1315,4 +1315,33 @@ test "unreact_with_emoji" do
       end
     end
   end
+
+  describe "update/3" do
+    test "updates a post" do
+      user = insert(:user)
+      {:ok, activity} = CommonAPI.post(user, %{status: "foo1", spoiler_text: "title 1"})
+
+      {:ok, updated} = CommonAPI.update(user, activity, %{status: "updated 2"})
+
+      updated_object = Object.normalize(updated)
+      assert updated_object.data["content"] == "updated 2"
+      assert Map.get(updated_object.data, "summary", "") == ""
+      assert Map.has_key?(updated_object.data, "updated")
+    end
+
+    test "does not change visibility" do
+      user = insert(:user)
+
+      {:ok, activity} =
+        CommonAPI.post(user, %{status: "foo1", spoiler_text: "title 1", visibility: "private"})
+
+      {:ok, updated} = CommonAPI.update(user, activity, %{status: "updated 2"})
+
+      updated_object = Object.normalize(updated)
+      assert updated_object.data["content"] == "updated 2"
+      assert Map.get(updated_object.data, "summary", "") == ""
+      assert Visibility.get_visibility(updated_object) == "private"
+      assert Visibility.get_visibility(updated) == "private"
+    end
+  end
 end
diff --git a/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs b/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
index c2104e099..065d9e767 100644
--- a/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
+++ b/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
@@ -2103,7 +2103,84 @@ test "it returns the source", %{conn: conn} do
 
       id = activity.id
 
-      assert %{"id" => ^id, "text" => "mew mew #abc", "spoiler_text" => "#def"} = json_response_and_validate_schema(conn, 200)
+      assert %{"id" => ^id, "text" => "mew mew #abc", "spoiler_text" => "#def"} =
+               json_response_and_validate_schema(conn, 200)
+    end
+  end
+
+  describe "update status" do
+    setup do
+      oauth_access(["write:statuses"])
+    end
+
+    test "it updates the status", %{conn: conn, user: user} do
+      {:ok, activity} = CommonAPI.post(user, %{status: "mew mew #abc", spoiler_text: "#def"})
+
+      response =
+        conn
+        |> put_req_header("content-type", "application/json")
+        |> put("/api/v1/statuses/#{activity.id}", %{
+          "status" => "edited",
+          "spoiler_text" => "lol"
+        })
+        |> json_response_and_validate_schema(200)
+
+      assert response["content"] == "edited"
+      assert response["spoiler_text"] == "lol"
+    end
+
+    test "it does not update visibility", %{conn: conn, user: user} do
+      {:ok, activity} =
+        CommonAPI.post(user, %{
+          status: "mew mew #abc",
+          spoiler_text: "#def",
+          visibility: "private"
+        })
+
+      response =
+        conn
+        |> put_req_header("content-type", "application/json")
+        |> put("/api/v1/statuses/#{activity.id}", %{
+          "status" => "edited",
+          "spoiler_text" => "lol"
+        })
+        |> json_response_and_validate_schema(200)
+
+      assert response["visibility"] == "private"
+    end
+
+    test "it refuses to update when original post is not by the user", %{conn: conn} do
+      another_user = insert(:user)
+
+      {:ok, activity} =
+        CommonAPI.post(another_user, %{status: "mew mew #abc", spoiler_text: "#def"})
+
+      conn
+      |> put_req_header("content-type", "application/json")
+      |> put("/api/v1/statuses/#{activity.id}", %{
+        "status" => "edited",
+        "spoiler_text" => "lol"
+      })
+      |> json_response_and_validate_schema(:forbidden)
+    end
+
+    test "it returns 404 if the user cannot see the post", %{conn: conn} do
+      another_user = insert(:user)
+
+      {:ok, activity} =
+        CommonAPI.post(another_user, %{
+          status: "mew mew #abc",
+          spoiler_text: "#def",
+          visibility: "private"
+        })
+
+      conn
+      |> put_req_header("content-type", "application/json")
+      |> put("/api/v1/statuses/#{activity.id}", %{
+        "status" => "edited",
+        "spoiler_text" => "lol"
+      })
+      |> json_response_and_validate_schema(:not_found)
     end
   end
 end
-- 
2.43.0


From 8067ecad465418f9d292453060d5297ad4a1f754 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Wed, 1 Jun 2022 12:02:03 -0400
Subject: [PATCH 08/48] Strip internal fields in formerRepresentation

---
 .../web/activity_pub/transmogrifier.ex        | 19 ++++++-
 .../web/activity_pub/transmogrifier_test.exs  | 54 +++++++++++++++++++
 2 files changed, 72 insertions(+), 1 deletion(-)

diff --git a/lib/pleroma/web/activity_pub/transmogrifier.ex b/lib/pleroma/web/activity_pub/transmogrifier.ex
index eea785a55..b75854f74 100644
--- a/lib/pleroma/web/activity_pub/transmogrifier.ex
+++ b/lib/pleroma/web/activity_pub/transmogrifier.ex
@@ -921,7 +921,24 @@ def prepare_attachments(object) do
   end
 
   def strip_internal_fields(object) do
-    Map.drop(object, Pleroma.Constants.object_internal_fields())
+    outer = Map.drop(object, Pleroma.Constants.object_internal_fields())
+
+    case outer do
+      %{"formerRepresentations" => %{"orderedItems" => list}} when is_list(list) ->
+        update_in(
+          outer["formerRepresentations"]["orderedItems"],
+          &Enum.map(
+            &1,
+            fn
+              item when is_map(item) -> Map.drop(item, Pleroma.Constants.object_internal_fields())
+              item -> item
+            end
+          )
+        )
+
+      _ ->
+        outer
+    end
   end
 
   defp strip_internal_tags(%{"tag" => tags} = object) do
diff --git a/test/pleroma/web/activity_pub/transmogrifier_test.exs b/test/pleroma/web/activity_pub/transmogrifier_test.exs
index 3756fdee0..4993f93fa 100644
--- a/test/pleroma/web/activity_pub/transmogrifier_test.exs
+++ b/test/pleroma/web/activity_pub/transmogrifier_test.exs
@@ -550,4 +550,58 @@ test "puts dimensions into attachment url field" do
       assert Transmogrifier.fix_attachments(object) == expected
     end
   end
+
+  describe "strip_internal_fields/1" do
+    test "it strips internal fields in formerRepresentations" do
+      original = %{
+        "formerRepresentations" => %{
+          "orderedItems" => [
+            %{"generator" => %{}}
+          ]
+        }
+      }
+
+      stripped = Transmogrifier.strip_internal_fields(original)
+
+      refute Map.has_key?(
+               Enum.at(stripped["formerRepresentations"]["orderedItems"], 0),
+               "generator"
+             )
+    end
+
+    test "it strips internal fields in maybe badly-formed formerRepresentations" do
+      original = %{
+        "formerRepresentations" => %{
+          "orderedItems" => [
+            %{"generator" => %{}},
+            "https://example.com/1"
+          ]
+        }
+      }
+
+      stripped = Transmogrifier.strip_internal_fields(original)
+
+      refute Map.has_key?(
+               Enum.at(stripped["formerRepresentations"]["orderedItems"], 0),
+               "generator"
+             )
+
+      assert Enum.at(stripped["formerRepresentations"]["orderedItems"], 1) ==
+               "https://example.com/1"
+    end
+
+    test "it ignores if formerRepresentations does not look like an OrderedCollection" do
+      original = %{
+        "formerRepresentations" => %{
+          "items" => [
+            %{"generator" => %{}}
+          ]
+        }
+      }
+
+      stripped = Transmogrifier.strip_internal_fields(original)
+
+      assert Map.has_key?(Enum.at(stripped["formerRepresentations"]["items"], 0), "generator")
+    end
+  end
 end
-- 
2.43.0


From 3a4fd61bba2df860ac3db957e2d979024c2d350c Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Wed, 1 Jun 2022 19:30:50 -0400
Subject: [PATCH 09/48] Inject history when object is refetched

---
 lib/pleroma/object.ex                        |  22 +++
 lib/pleroma/object/fetcher.ex                |  27 +++
 lib/pleroma/web/activity_pub/side_effects.ex |  24 +--
 test/pleroma/object/fetcher_test.exs         | 187 +++++++++++++++++++
 4 files changed, 237 insertions(+), 23 deletions(-)

diff --git a/lib/pleroma/object.ex b/lib/pleroma/object.ex
index 4eb337236..88fc28756 100644
--- a/lib/pleroma/object.ex
+++ b/lib/pleroma/object.ex
@@ -445,4 +445,26 @@ defp history_skeleton do
       "orderedItems" => []
     }
   end
+
+  def maybe_update_history(updated_object, orig_object_data, updated) do
+    if not updated do
+      updated_object
+    else
+      # Put edit history
+      # Note that we may have got the edit history by first fetching the object
+      history = Object.history_for(orig_object_data)
+
+      latest_history_item =
+        orig_object_data
+        |> Map.drop(["id", "formerRepresentations"])
+
+      new_history =
+        history
+        |> Map.put("orderedItems", [latest_history_item | history["orderedItems"]])
+        |> Map.put("totalItems", history["totalItems"] + 1)
+
+      updated_object
+      |> Map.put("formerRepresentations", new_history)
+    end
+  end
 end
diff --git a/lib/pleroma/object/fetcher.ex b/lib/pleroma/object/fetcher.ex
index 4ca67f0fd..4289107e0 100644
--- a/lib/pleroma/object/fetcher.ex
+++ b/lib/pleroma/object/fetcher.ex
@@ -26,8 +26,35 @@ defp touch_changeset(changeset) do
   end
 
   defp maybe_reinject_internal_fields(%{data: %{} = old_data}, new_data) do
+    has_history? = fn
+      %{"formerRepresentations" => %{"orderedItems" => list}} when is_list(list) -> true
+      _ -> false
+    end
+
     internal_fields = Map.take(old_data, Pleroma.Constants.object_internal_fields())
 
+    remote_history_exists? = has_history?.(new_data)
+
+    # If the remote history exists, we treat that as the only source of truth.
+    new_data =
+      if has_history?.(old_data) and not remote_history_exists? do
+        Map.put(new_data, "formerRepresentations", old_data["formerRepresentations"])
+      else
+        new_data
+      end
+
+    # If the remote does not have history information, we need to manage it ourselves
+    new_data =
+      if not remote_history_exists? do
+        changed? =
+          Pleroma.Constants.status_updatable_fields()
+          |> Enum.any?(fn field -> Map.get(old_data, field) != Map.get(new_data, field) end)
+
+        new_data |> Object.maybe_update_history(old_data, changed?)
+      else
+        new_data
+      end
+
     Map.merge(new_data, internal_fields)
   end
 
diff --git a/lib/pleroma/web/activity_pub/side_effects.ex b/lib/pleroma/web/activity_pub/side_effects.ex
index f3ddaacdd..799f22b51 100644
--- a/lib/pleroma/web/activity_pub/side_effects.ex
+++ b/lib/pleroma/web/activity_pub/side_effects.ex
@@ -436,28 +436,6 @@ defp update_content_fields(orig_object_data, updated_object) do
     )
   end
 
-  defp maybe_update_history(updated_object, orig_object_data, updated) do
-    if not updated do
-      updated_object
-    else
-      # Put edit history
-      # Note that we may have got the edit history by first fetching the object
-      history = Object.history_for(orig_object_data)
-
-      latest_history_item =
-        orig_object_data
-        |> Map.drop(["id", "formerRepresentations"])
-
-      new_history =
-        history
-        |> Map.put("orderedItems", [latest_history_item | history["orderedItems"]])
-        |> Map.put("totalItems", history["totalItems"] + 1)
-
-      updated_object
-      |> Map.put("formerRepresentations", new_history)
-    end
-  end
-
   defp maybe_update_poll(to_be_updated, updated_object) do
     choice_key = fn data ->
       if Map.has_key?(data, "anyOf"), do: "anyOf", else: "oneOf"
@@ -492,7 +470,7 @@ defp handle_update_object(
 
       updated_object_data =
         updated_object_data
-        |> maybe_update_history(orig_object_data, updated)
+        |> Object.maybe_update_history(orig_object_data, updated)
         |> maybe_update_poll(updated_object)
 
       orig_object
diff --git a/test/pleroma/object/fetcher_test.exs b/test/pleroma/object/fetcher_test.exs
index bd0a6e497..585be0376 100644
--- a/test/pleroma/object/fetcher_test.exs
+++ b/test/pleroma/object/fetcher_test.exs
@@ -269,4 +269,191 @@ test "it can refetch pruned objects" do
       refute called(Pleroma.Signature.sign(:_, :_))
     end
   end
+
+  describe "refetching" do
+    setup do
+      object1 = %{
+        "id" => "https://mastodon.social/1",
+        "actor" => "https://mastodon.social/users/emelie",
+        "attributedTo" => "https://mastodon.social/users/emelie",
+        "type" => "Note",
+        "content" => "test 1",
+        "bcc" => [],
+        "bto" => [],
+        "cc" => [],
+        "to" => [],
+        "summary" => ""
+      }
+
+      object2 = %{
+        "id" => "https://mastodon.social/2",
+        "actor" => "https://mastodon.social/users/emelie",
+        "attributedTo" => "https://mastodon.social/users/emelie",
+        "type" => "Note",
+        "content" => "test 2",
+        "bcc" => [],
+        "bto" => [],
+        "cc" => [],
+        "to" => [],
+        "summary" => "",
+        "formerRepresentations" => %{
+          "type" => "OrderedCollection",
+          "orderedItems" => [
+            %{
+              "type" => "Note",
+              "content" => "orig 2",
+              "actor" => "https://mastodon.social/users/emelie",
+              "attributedTo" => "https://mastodon.social/users/emelie",
+              "bcc" => [],
+              "bto" => [],
+              "cc" => [],
+              "to" => [],
+              "summary" => ""
+            }
+          ],
+          "totalItems" => 1
+        }
+      }
+
+      mock(fn
+        %{
+          method: :get,
+          url: "https://mastodon.social/1"
+        } ->
+          %Tesla.Env{
+            status: 200,
+            headers: [{"content-type", "application/activity+json"}],
+            body: Jason.encode!(object1)
+          }
+
+        %{
+          method: :get,
+          url: "https://mastodon.social/2"
+        } ->
+          %Tesla.Env{
+            status: 200,
+            headers: [{"content-type", "application/activity+json"}],
+            body: Jason.encode!(object2)
+          }
+
+        %{
+          method: :get,
+          url: "https://mastodon.social/users/emelie/collections/featured"
+        } ->
+          %Tesla.Env{
+            status: 200,
+            headers: [{"content-type", "application/activity+json"}],
+            body:
+              Jason.encode!(%{
+                "id" => "https://mastodon.social/users/emelie/collections/featured",
+                "type" => "OrderedCollection",
+                "actor" => "https://mastodon.social/users/emelie",
+                "attributedTo" => "https://mastodon.social/users/emelie",
+                "orderedItems" => [],
+                "totalItems" => 0
+              })
+          }
+
+        env ->
+          apply(HttpRequestMock, :request, [env])
+      end)
+
+      %{object1: object1, object2: object2}
+    end
+
+    test "it keeps formerRepresentations if remote does not have this attr", %{object1: object1} do
+      full_object1 =
+        object1
+        |> Map.merge(%{
+          "formerRepresentations" => %{
+            "type" => "OrderedCollection",
+            "orderedItems" => [
+              %{
+                "type" => "Note",
+                "content" => "orig 2",
+                "actor" => "https://mastodon.social/users/emelie",
+                "attributedTo" => "https://mastodon.social/users/emelie",
+                "bcc" => [],
+                "bto" => [],
+                "cc" => [],
+                "to" => [],
+                "summary" => ""
+              }
+            ],
+            "totalItems" => 1
+          }
+        })
+
+      {:ok, o} = Object.create(full_object1)
+
+      assert {:ok, refetched} = Fetcher.refetch_object(o)
+
+      assert %{"formerRepresentations" => %{"orderedItems" => [%{"content" => "orig 2"}]}} =
+               refetched.data
+    end
+
+    test "it uses formerRepresentations from remote if possible", %{object2: object2} do
+      {:ok, o} = Object.create(object2)
+
+      assert {:ok, refetched} = Fetcher.refetch_object(o)
+
+      assert %{"formerRepresentations" => %{"orderedItems" => [%{"content" => "orig 2"}]}} =
+               refetched.data
+    end
+
+    test "it replaces formerRepresentations with the one from remote", %{object2: object2} do
+      full_object2 =
+        object2
+        |> Map.merge(%{
+          "content" => "mew mew #def",
+          "formerRepresentations" => %{
+            "type" => "OrderedCollection",
+            "orderedItems" => [
+              %{"type" => "Note", "content" => "mew mew 2"}
+            ],
+            "totalItems" => 1
+          }
+        })
+
+      {:ok, o} = Object.create(full_object2)
+
+      assert {:ok, refetched} = Fetcher.refetch_object(o)
+
+      assert %{
+               "content" => "test 2",
+               "formerRepresentations" => %{"orderedItems" => [%{"content" => "orig 2"}]}
+             } = refetched.data
+    end
+
+    test "it adds to formerRepresentations if the remote does not have one and the object has changed",
+         %{object1: object1} do
+      full_object1 =
+        object1
+        |> Map.merge(%{
+          "content" => "mew mew #def",
+          "formerRepresentations" => %{
+            "type" => "OrderedCollection",
+            "orderedItems" => [
+              %{"type" => "Note", "content" => "mew mew 1"}
+            ],
+            "totalItems" => 1
+          }
+        })
+
+      {:ok, o} = Object.create(full_object1)
+
+      assert {:ok, refetched} = Fetcher.refetch_object(o)
+
+      assert %{
+               "content" => "test 1",
+               "formerRepresentations" => %{
+                 "orderedItems" => [
+                   %{"content" => "mew mew #def"},
+                   %{"content" => "mew mew 1"}
+                 ],
+                 "totalItems" => 2
+               }
+             } = refetched.data
+    end
+  end
 end
-- 
2.43.0


From a7bf1f27df37c9e51d1b8f95c85d5770743705d1 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Fri, 3 Jun 2022 21:15:17 -0400
Subject: [PATCH 10/48] Stream out edits

---
 lib/pleroma/web/activity_pub/activity_pub.ex | 13 ++++++--
 lib/pleroma/web/activity_pub/side_effects.ex |  6 ++++
 lib/pleroma/web/streamer.ex                  | 14 +++++++++
 lib/pleroma/web/views/streamer_view.ex       | 31 ++++++++++++++++++
 test/pleroma/web/streamer_test.exs           | 33 ++++++++++++++++++++
 5 files changed, 95 insertions(+), 2 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/activity_pub.ex b/lib/pleroma/web/activity_pub/activity_pub.ex
index 4eeba9903..d8656830f 100644
--- a/lib/pleroma/web/activity_pub/activity_pub.ex
+++ b/lib/pleroma/web/activity_pub/activity_pub.ex
@@ -194,7 +194,16 @@ defp insert_activity_with_expiration(data, local, recipients) do
   def notify_and_stream(activity) do
     Notification.create_notifications(activity)
 
-    conversation = create_or_bump_conversation(activity, activity.actor)
+    original_activity =
+      case activity do
+        %{data: %{"type" => "Update"}, object: %{data: %{"id" => id}}} ->
+          Activity.get_create_by_object_ap_id_with_object(id)
+
+        _ ->
+          activity
+      end
+
+    conversation = create_or_bump_conversation(original_activity, original_activity.actor)
     participations = get_participations(conversation)
     stream_out(activity)
     stream_out_participations(participations)
@@ -260,7 +269,7 @@ def stream_out_participations(_, _), do: :noop
 
   @impl true
   def stream_out(%Activity{data: %{"type" => data_type}} = activity)
-      when data_type in ["Create", "Announce", "Delete"] do
+      when data_type in ["Create", "Announce", "Delete", "Update"] do
     activity
     |> Topics.get_activity_topics()
     |> Streamer.stream(activity)
diff --git a/lib/pleroma/web/activity_pub/side_effects.ex b/lib/pleroma/web/activity_pub/side_effects.ex
index 799f22b51..5d7b9165a 100644
--- a/lib/pleroma/web/activity_pub/side_effects.ex
+++ b/lib/pleroma/web/activity_pub/side_effects.ex
@@ -477,6 +477,12 @@ defp handle_update_object(
       |> Repo.preload(:hashtags)
       |> Object.change(%{data: updated_object_data})
       |> Object.update_and_set_cache()
+
+      if updated do
+        object
+        |> Activity.normalize()
+        |> ActivityPub.notify_and_stream()
+      end
     end
 
     {:ok, object, meta}
diff --git a/lib/pleroma/web/streamer.ex b/lib/pleroma/web/streamer.ex
index 9a4ac1317..3d7798b9c 100644
--- a/lib/pleroma/web/streamer.ex
+++ b/lib/pleroma/web/streamer.ex
@@ -282,6 +282,20 @@ defp push_to_socket(topic, %Activity{
 
   defp push_to_socket(_topic, %Activity{data: %{"type" => "Delete"}}), do: :noop
 
+  defp push_to_socket(topic, %Activity{data: %{"type" => "Update"}} = item) do
+    anon_render = StreamerView.render("status_update.json", item)
+
+    Registry.dispatch(@registry, topic, fn list ->
+      Enum.each(list, fn {pid, auth?} ->
+        if auth? do
+          send(pid, {:render_with_user, StreamerView, "status_update.json", item})
+        else
+          send(pid, {:text, anon_render})
+        end
+      end)
+    end)
+  end
+
   defp push_to_socket(topic, item) do
     anon_render = StreamerView.render("update.json", item)
 
diff --git a/lib/pleroma/web/views/streamer_view.ex b/lib/pleroma/web/views/streamer_view.ex
index de2e4d1e9..ad278f2f4 100644
--- a/lib/pleroma/web/views/streamer_view.ex
+++ b/lib/pleroma/web/views/streamer_view.ex
@@ -25,6 +25,22 @@ def render("update.json", %Activity{} = activity, %User{} = user) do
     |> Jason.encode!()
   end
 
+  def render("status_update.json", %Activity{} = activity, %User{} = user) do
+    activity = Activity.get_create_by_object_ap_id_with_object(activity.object.data["id"])
+
+    %{
+      event: "status.update",
+      payload:
+        Pleroma.Web.MastodonAPI.StatusView.render(
+          "show.json",
+          activity: activity,
+          for: user
+        )
+        |> Jason.encode!()
+    }
+    |> Jason.encode!()
+  end
+
   def render("notification.json", %Notification{} = notify, %User{} = user) do
     %{
       event: "notification",
@@ -51,6 +67,21 @@ def render("update.json", %Activity{} = activity) do
     |> Jason.encode!()
   end
 
+  def render("status_update.json", %Activity{} = activity) do
+    activity = Activity.get_create_by_object_ap_id_with_object(activity.object.data["id"])
+
+    %{
+      event: "status.update",
+      payload:
+        Pleroma.Web.MastodonAPI.StatusView.render(
+          "show.json",
+          activity: activity
+        )
+        |> Jason.encode!()
+    }
+    |> Jason.encode!()
+  end
+
   def render("follow_relationships_update.json", item) do
     %{
       event: "pleroma:follow_relationships_update",
diff --git a/test/pleroma/web/streamer_test.exs b/test/pleroma/web/streamer_test.exs
index 841db0e91..0817f8444 100644
--- a/test/pleroma/web/streamer_test.exs
+++ b/test/pleroma/web/streamer_test.exs
@@ -374,6 +374,20 @@ test "it sends follow relationships updates to the 'user' stream", %{
                "state" => "follow_accept"
              } = Jason.decode!(payload)
     end
+
+    test "it streams edits in the 'user' stream", %{user: user, token: oauth_token} do
+      sender = insert(:user)
+      {:ok, _, _, _} = CommonAPI.follow(user, sender)
+
+      {:ok, activity} = CommonAPI.post(sender, %{status: "hey"})
+
+      Streamer.get_topic_and_add_socket("user", user, oauth_token)
+      {:ok, edited} = CommonAPI.update(sender, activity, %{status: "mew mew"})
+      edited = Pleroma.Activity.normalize(edited)
+
+      assert_receive {:render_with_user, _, "status_update.json", ^edited}
+      refute Streamer.filtered_by_user?(user, edited)
+    end
   end
 
   describe "public streams" do
@@ -416,6 +430,25 @@ test "handles deletions" do
       assert_receive {:text, event}
       assert %{"event" => "delete", "payload" => ^activity_id} = Jason.decode!(event)
     end
+
+    test "it streams edits in the 'public' stream" do
+      sender = insert(:user)
+
+      Streamer.get_topic_and_add_socket("public", nil, nil)
+      {:ok, activity} = CommonAPI.post(sender, %{status: "hey"})
+      assert_receive {:text, _}
+
+      {:ok, edited} = CommonAPI.update(sender, activity, %{status: "mew mew"})
+
+      edited = Pleroma.Activity.normalize(edited)
+
+      %{id: activity_id} = Pleroma.Activity.get_create_by_object_ap_id(edited.object.data["id"])
+
+      assert_receive {:text, event}
+      assert %{"event" => "status.update", "payload" => payload} = Jason.decode!(event)
+      assert %{"id" => ^activity_id} = Jason.decode!(payload)
+      refute Streamer.filtered_by_user?(sender, edited)
+    end
   end
 
   describe "thread_containment/2" do
-- 
2.43.0


From 920a5c71078e9c43651bf2a6d79a7a54e551273f Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Fri, 3 Jun 2022 21:17:16 -0400
Subject: [PATCH 11/48] Test that own edits are streamed

---
 test/pleroma/web/streamer_test.exs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/test/pleroma/web/streamer_test.exs b/test/pleroma/web/streamer_test.exs
index 0817f8444..1fc35dcc5 100644
--- a/test/pleroma/web/streamer_test.exs
+++ b/test/pleroma/web/streamer_test.exs
@@ -388,6 +388,17 @@ test "it streams edits in the 'user' stream", %{user: user, token: oauth_token}
       assert_receive {:render_with_user, _, "status_update.json", ^edited}
       refute Streamer.filtered_by_user?(user, edited)
     end
+
+    test "it streams own edits in the 'user' stream", %{user: user, token: oauth_token} do
+      {:ok, activity} = CommonAPI.post(user, %{status: "hey"})
+
+      Streamer.get_topic_and_add_socket("user", user, oauth_token)
+      {:ok, edited} = CommonAPI.update(user, activity, %{status: "mew mew"})
+      edited = Pleroma.Activity.normalize(edited)
+
+      assert_receive {:render_with_user, _, "status_update.json", ^edited}
+      refute Streamer.filtered_by_user?(user, edited)
+    end
   end
 
   describe "public streams" do
-- 
2.43.0


From d236c091ad77e0e49d7b22c7a8027e69fac1a806 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Fri, 3 Jun 2022 21:47:40 -0400
Subject: [PATCH 12/48] Show edited_at in MastodonAPI/show

---
 lib/pleroma/web/api_spec/schemas/status.ex       |  6 ++++++
 .../web/mastodon_api/views/status_view.ex        | 11 +++++++++++
 .../web/mastodon_api/views/status_view_test.exs  | 16 ++++++++++++++++
 3 files changed, 33 insertions(+)

diff --git a/lib/pleroma/web/api_spec/schemas/status.ex b/lib/pleroma/web/api_spec/schemas/status.ex
index 60db8ad6f..212ac1724 100644
--- a/lib/pleroma/web/api_spec/schemas/status.ex
+++ b/lib/pleroma/web/api_spec/schemas/status.ex
@@ -73,6 +73,12 @@ defmodule Pleroma.Web.ApiSpec.Schemas.Status do
         format: "date-time",
         description: "The date when this status was created"
       },
+      edited_at: %Schema{
+        type: :string,
+        format: "date-time",
+        nullable: true,
+        description: "The date when this status was last edited"
+      },
       emojis: %Schema{
         type: :array,
         items: Emoji,
diff --git a/lib/pleroma/web/mastodon_api/views/status_view.ex b/lib/pleroma/web/mastodon_api/views/status_view.ex
index 3718d0e40..a2a63e06e 100644
--- a/lib/pleroma/web/mastodon_api/views/status_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/status_view.ex
@@ -257,6 +257,16 @@ def render("show.json", %{activity: %{data: %{"object" => _object}} = activity}
 
     created_at = Utils.to_masto_date(object.data["published"])
 
+    edited_at =
+      with %{"updated" => updated} <- object.data,
+           date <- Utils.to_masto_date(updated),
+           true <- date != "" do
+        date
+      else
+        _ ->
+          nil
+      end
+
     reply_to = get_reply_to(activity, opts)
 
     reply_to_user = reply_to && CommonAPI.get_user(reply_to.data["actor"])
@@ -347,6 +357,7 @@ def render("show.json", %{activity: %{data: %{"object" => _object}} = activity}
       content: content_html,
       text: opts[:with_source] && object.data["source"],
       created_at: created_at,
+      edited_at: edited_at,
       reblogs_count: announcement_count,
       replies_count: object.data["repliesCount"] || 0,
       favourites_count: like_count,
diff --git a/test/pleroma/web/mastodon_api/views/status_view_test.exs b/test/pleroma/web/mastodon_api/views/status_view_test.exs
index 9ef44caca..6d902a8b6 100644
--- a/test/pleroma/web/mastodon_api/views/status_view_test.exs
+++ b/test/pleroma/web/mastodon_api/views/status_view_test.exs
@@ -260,6 +260,7 @@ test "a note activity" do
       content: HTML.filter_tags(object_data["content"]),
       text: nil,
       created_at: created_at,
+      edited_at: nil,
       reblogs_count: 0,
       replies_count: 0,
       favourites_count: 0,
@@ -751,4 +752,19 @@ test "has a field for parent visibility" do
     status = StatusView.render("show.json", activity: visible, for: poster)
     assert status.pleroma.parent_visible
   end
+
+  test "it shows edited_at" do
+    poster = insert(:user)
+
+    {:ok, post} = CommonAPI.post(poster, %{status: "hey"})
+
+    status = StatusView.render("show.json", activity: post)
+    refute status.edited_at
+
+    {:ok, _} = CommonAPI.update(poster, post, %{status: "mew mew"})
+    edited = Pleroma.Activity.normalize(post)
+
+    status = StatusView.render("show.json", activity: edited)
+    assert status.edited_at
+  end
 end
-- 
2.43.0


From 3a24185dd462ed0c1149a2a443b35adf5c8b56bd Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Fri, 3 Jun 2022 21:50:49 -0400
Subject: [PATCH 13/48] Fix SideEffectsTest

---
 test/pleroma/web/activity_pub/side_effects_test.exs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/test/pleroma/web/activity_pub/side_effects_test.exs b/test/pleroma/web/activity_pub/side_effects_test.exs
index c2b923f1c..9fb583dbf 100644
--- a/test/pleroma/web/activity_pub/side_effects_test.exs
+++ b/test/pleroma/web/activity_pub/side_effects_test.exs
@@ -149,6 +149,7 @@ test "it uses a given changeset to update", %{user: user, update: update} do
     setup do
       user = insert(:user)
       note = insert(:note, user: user)
+      _note_activity = insert(:note_activity, note: note)
 
       updated_note =
         note.data
-- 
2.43.0


From 3865ed5e0b52824e4982d91ec4b9bb7e1a168286 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sat, 4 Jun 2022 12:56:56 -0400
Subject: [PATCH 14/48] Expose content type of status sources

---
 .../API/differences_in_mastoapi_responses.md  |  4 +++
 .../api_spec/operations/status_operation.ex   |  4 +++
 lib/pleroma/web/common_api/activity_draft.ex  |  1 +
 lib/pleroma/web/common_api/utils.ex           |  2 +-
 .../web/mastodon_api/views/status_view.ex     | 27 ++++++++++++--
 .../mastodon_api/views/status_view_test.exs   | 36 +++++++++++++++++++
 6 files changed, 70 insertions(+), 4 deletions(-)

diff --git a/docs/docs/development/API/differences_in_mastoapi_responses.md b/docs/docs/development/API/differences_in_mastoapi_responses.md
index 4465784bf..752be1762 100644
--- a/docs/docs/development/API/differences_in_mastoapi_responses.md
+++ b/docs/docs/development/API/differences_in_mastoapi_responses.md
@@ -40,6 +40,10 @@ Has these additional fields under the `pleroma` object:
 - `parent_visible`: If the parent of this post is visible to the user or not.
 - `pinned_at`: a datetime (iso8601) when status was pinned, `null` otherwise.
 
+The `GET /api/v1/statuses/:id/source` endpoint additionally has the following attributes:
+
+- `content_type`: The content type of the status source.
+
 ## Scheduled statuses
 
 Has these additional fields in `params`:
diff --git a/lib/pleroma/web/api_spec/operations/status_operation.ex b/lib/pleroma/web/api_spec/operations/status_operation.ex
index 2f556f3b6..24f5ce2a2 100644
--- a/lib/pleroma/web/api_spec/operations/status_operation.ex
+++ b/lib/pleroma/web/api_spec/operations/status_operation.ex
@@ -738,6 +738,10 @@ defp status_source_response do
             type: :string,
             description:
               "Subject or summary line, below which status content is collapsed until expanded"
+          },
+          content_type: %Schema{
+            type: :string,
+            description: "The content type of the source"
           }
         }
       }
diff --git a/lib/pleroma/web/common_api/activity_draft.ex b/lib/pleroma/web/common_api/activity_draft.ex
index 767b2bf0f..a672fc2e5 100644
--- a/lib/pleroma/web/common_api/activity_draft.ex
+++ b/lib/pleroma/web/common_api/activity_draft.ex
@@ -222,6 +222,7 @@ defp object(draft) do
       |> Map.put("source", %{
         "content" => draft.status,
         "mediaType" => draft.params[:content_type]
+        "mediaType" => Utils.get_content_type(draft.params[:content_type])
       })
       |> Map.put("generator", draft.params[:generator])
 
diff --git a/lib/pleroma/web/common_api/utils.ex b/lib/pleroma/web/common_api/utils.ex
index f5bc3acf5..6058989a5 100644
--- a/lib/pleroma/web/common_api/utils.ex
+++ b/lib/pleroma/web/common_api/utils.ex
@@ -219,7 +219,7 @@ def make_content_html(%ActivityDraft{} = draft) do
     |> maybe_add_attachments(draft.attachments, attachment_links)
   end
 
-  defp get_content_type(content_type) do
+  def get_content_type(content_type) do
     if Enum.member?(Config.get([:instance, :allowed_post_formats]), content_type) do
       content_type
     else
diff --git a/lib/pleroma/web/mastodon_api/views/status_view.ex b/lib/pleroma/web/mastodon_api/views/status_view.ex
index a2a63e06e..203bebca9 100644
--- a/lib/pleroma/web/mastodon_api/views/status_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/status_view.ex
@@ -355,7 +355,7 @@ def render("show.json", %{activity: %{data: %{"object" => _object}} = activity}
       reblog: nil,
       card: card,
       content: content_html,
-      text: opts[:with_source] && object.data["source"],
+      text: opts[:with_source] && get_source_text(object.data["source"]),
       created_at: created_at,
       edited_at: edited_at,
       reblogs_count: announcement_count,
@@ -471,8 +471,9 @@ def render("source.json", %{activity: %{data: %{"object" => _object}} = activity
 
     %{
       id: activity.id,
-      text: Map.get(object.data, "source", ""),
-      spoiler_text: Map.get(object.data, "summary", "")
+      text: get_source_text(Map.get(object.data, "source", "")),
+      spoiler_text: Map.get(object.data, "summary", ""),
+      content_type: get_source_content_type(object.data["source"])
     }
   end
 
@@ -709,4 +710,24 @@ defp maybe_render_quote(quote, opts) do
       render("show.json", opts)
     end
   end
+
+  defp get_source_text(%{"content" => content} = _source) do
+    content
+  end
+
+  defp get_source_text(source) when is_binary(source) do
+    source
+  end
+
+  defp get_source_text(_) do
+    ""
+  end
+
+  defp get_source_content_type(%{"mediaType" => type} = _source) do
+    type
+  end
+
+  defp get_source_content_type(_source) do
+    Utils.get_content_type(nil)
+  end
 end
diff --git a/test/pleroma/web/mastodon_api/views/status_view_test.exs b/test/pleroma/web/mastodon_api/views/status_view_test.exs
index 6d902a8b6..9a5978cef 100644
--- a/test/pleroma/web/mastodon_api/views/status_view_test.exs
+++ b/test/pleroma/web/mastodon_api/views/status_view_test.exs
@@ -767,4 +767,40 @@ test "it shows edited_at" do
     status = StatusView.render("show.json", activity: edited)
     assert status.edited_at
   end
+
+  test "with a source object" do
+    note =
+      insert(:note,
+        data: %{"source" => %{"content" => "object source", "mediaType" => "text/markdown"}}
+      )
+
+    activity = insert(:note_activity, note: note)
+
+    status = StatusView.render("show.json", activity: activity, with_source: true)
+    assert status.text == "object source"
+  end
+
+  describe "source.json" do
+    test "with a source object, renders both source and content type" do
+      note =
+        insert(:note,
+          data: %{"source" => %{"content" => "object source", "mediaType" => "text/markdown"}}
+        )
+
+      activity = insert(:note_activity, note: note)
+
+      status = StatusView.render("source.json", activity: activity)
+      assert status.text == "object source"
+      assert status.content_type == "text/markdown"
+    end
+
+    test "with a source string, renders source and put text/plain as the content type" do
+      note = insert(:note, data: %{"source" => "string source"})
+      activity = insert(:note_activity, note: note)
+
+      status = StatusView.render("source.json", activity: activity)
+      assert status.text == "string source"
+      assert status.content_type == "text/plain"
+    end
+  end
 end
-- 
2.43.0


From 8a8b135f0971dd6cbbbf9c6b83cca4bb6e2648e9 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sun, 5 Jun 2022 15:02:25 -0400
Subject: [PATCH 15/48] Create Update notifications

---
 lib/pleroma/notification.ex                   | 22 +++++++-
 ...85734_add_update_to_notifications_enum.exs | 51 +++++++++++++++++++
 test/pleroma/notification_test.exs            | 46 +++++++++++++++++
 3 files changed, 117 insertions(+), 2 deletions(-)
 create mode 100644 priv/repo/migrations/20220605185734_add_update_to_notifications_enum.exs

diff --git a/lib/pleroma/notification.ex b/lib/pleroma/notification.ex
index d8878338e..e62ae0ec9 100644
--- a/lib/pleroma/notification.ex
+++ b/lib/pleroma/notification.ex
@@ -384,7 +384,7 @@ def create_notifications(%Activity{data: %{"to" => _, "type" => "Create"}} = act
   end
 
   def create_notifications(%Activity{data: %{"type" => type}} = activity, options)
-      when type in ["Follow", "Like", "Announce", "Move", "EmojiReact", "Flag"] do
+      when type in ["Follow", "Like", "Announce", "Move", "EmojiReact", "Flag", "Update"] do
     do_create_notifications(activity, options)
   end
 
@@ -438,6 +438,9 @@ defp type_from_activity(%{data: %{"type" => type}} = activity) do
         activity
         |> type_from_activity_object()
 
+      "Update" ->
+        "update"
+
       t ->
         raise "No notification type for activity type #{t}"
     end
@@ -503,7 +506,7 @@ def create_poll_notifications(%Activity{} = activity) do
   def get_notified_from_activity(activity, local_only \\ true)
 
   def get_notified_from_activity(%Activity{data: %{"type" => type}} = activity, local_only)
-      when type in ["Create", "Like", "Announce", "Follow", "Move", "EmojiReact", "Flag"] do
+      when type in ["Create", "Like", "Announce", "Follow", "Move", "EmojiReact", "Flag", "Update"] do
     potential_receiver_ap_ids = get_potential_receiver_ap_ids(activity)
 
     potential_receivers =
@@ -543,6 +546,21 @@ def get_potential_receiver_ap_ids(%{data: %{"type" => "Flag", "actor" => actor}}
     (User.all_superusers() |> Enum.map(fn user -> user.ap_id end)) -- [actor]
   end
 
+  # Update activity: notify all who repeated this
+  def get_potential_receiver_ap_ids(%{data: %{"type" => "Update", "actor" => actor}} = activity) do
+    with %Object{data: %{"id" => object_id}} <- Object.normalize(activity, fetch: false) do
+      repeaters =
+        Activity.Queries.by_type("Announce")
+        |> Activity.Queries.by_object_id(object_id)
+        |> Activity.with_joined_user_actor()
+        |> where([a, u], u.local)
+        |> select([a, u], u.ap_id)
+        |> Repo.all()
+
+      repeaters -- [actor]
+    end
+  end
+
   def get_potential_receiver_ap_ids(activity) do
     []
     |> Utils.maybe_notify_to_recipients(activity)
diff --git a/priv/repo/migrations/20220605185734_add_update_to_notifications_enum.exs b/priv/repo/migrations/20220605185734_add_update_to_notifications_enum.exs
new file mode 100644
index 000000000..0656c885f
--- /dev/null
+++ b/priv/repo/migrations/20220605185734_add_update_to_notifications_enum.exs
@@ -0,0 +1,51 @@
+defmodule Pleroma.Repo.Migrations.AddUpdateToNotificationsEnum do
+  use Ecto.Migration
+
+  @disable_ddl_transaction true
+
+  def up do
+    """
+    alter type notification_type add value 'update'
+    """
+    |> execute()
+  end
+
+  # 20210717000000_add_poll_to_notifications_enum.exs
+  def down do
+    alter table(:notifications) do
+      modify(:type, :string)
+    end
+
+    """
+    delete from notifications where type = 'update'
+    """
+    |> execute()
+
+    """
+    drop type if exists notification_type
+    """
+    |> execute()
+
+    """
+    create type notification_type as enum (
+      'follow',
+      'follow_request',
+      'mention',
+      'move',
+      'pleroma:emoji_reaction',
+      'pleroma:chat_mention',
+      'reblog',
+      'favourite',
+      'pleroma:report',
+      'poll'
+    )
+    """
+    |> execute()
+
+    """
+    alter table notifications
+    alter column type type notification_type using (type::notification_type)
+    """
+    |> execute()
+  end
+end
diff --git a/test/pleroma/notification_test.exs b/test/pleroma/notification_test.exs
index b47edd0a3..a7b271ecd 100644
--- a/test/pleroma/notification_test.exs
+++ b/test/pleroma/notification_test.exs
@@ -127,6 +127,28 @@ test "does not create a notification for subscribed users if status is a reply"
       subscriber_notifications = Notification.for_user(subscriber)
       assert Enum.empty?(subscriber_notifications)
     end
+
+    test "it sends edited notifications to those who repeated a status" do
+      user = insert(:user)
+      repeated_user = insert(:user)
+      other_user = insert(:user)
+
+      {:ok, activity_one} =
+        CommonAPI.post(user, %{
+          status: "hey @#{other_user.nickname}!"
+        })
+
+      {:ok, _activity_two} = CommonAPI.repeat(activity_one.id, repeated_user)
+
+      {:ok, _edit_activity} =
+        CommonAPI.update(user, activity_one, %{
+          status: "hey @#{other_user.nickname}! mew mew"
+        })
+
+      assert [%{type: "reblog"}] = Notification.for_user(user)
+      assert [%{type: "update"}] = Notification.for_user(repeated_user)
+      assert [%{type: "mention"}] = Notification.for_user(other_user)
+    end
   end
 
   test "create_poll_notifications/1" do
@@ -839,6 +861,30 @@ test "it returns following domain-blocking recipient in enabled recipients list"
       assert [other_user] == enabled_receivers
       assert [] == disabled_receivers
     end
+
+    test "it sends edited notifications to those who repeated a status" do
+      user = insert(:user)
+      repeated_user = insert(:user)
+      other_user = insert(:user)
+
+      {:ok, activity_one} =
+        CommonAPI.post(user, %{
+          status: "hey @#{other_user.nickname}!"
+        })
+
+      {:ok, _activity_two} = CommonAPI.repeat(activity_one.id, repeated_user)
+
+      {:ok, edit_activity} =
+        CommonAPI.update(user, activity_one, %{
+          status: "hey @#{other_user.nickname}! mew mew"
+        })
+
+      {enabled_receivers, _disabled_receivers} =
+        Notification.get_notified_from_activity(edit_activity)
+
+      assert repeated_user in enabled_receivers
+      assert other_user not in enabled_receivers
+    end
   end
 
   describe "notification lifecycle" do
-- 
2.43.0


From bb016795cebf81ebc7429087c65e0b1e8b0fef84 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sun, 5 Jun 2022 16:34:42 -0400
Subject: [PATCH 16/48] Return update notification in mastodon api

---
 .../controllers/notification_controller.ex    |  1 +
 .../mastodon_api/views/notification_view.ex   | 15 ++++++++---
 .../views/notification_view_test.exs          | 26 +++++++++++++++++++
 3 files changed, 38 insertions(+), 4 deletions(-)

diff --git a/lib/pleroma/web/mastodon_api/controllers/notification_controller.ex b/lib/pleroma/web/mastodon_api/controllers/notification_controller.ex
index ae4432e85..8e6cf2a6a 100644
--- a/lib/pleroma/web/mastodon_api/controllers/notification_controller.ex
+++ b/lib/pleroma/web/mastodon_api/controllers/notification_controller.ex
@@ -51,6 +51,7 @@ def index(conn, %{account_id: account_id} = params) do
     move
     pleroma:emoji_reaction
     poll
+    update
   }
   def index(%{assigns: %{user: user}} = conn, params) do
     params =
diff --git a/lib/pleroma/web/mastodon_api/views/notification_view.ex b/lib/pleroma/web/mastodon_api/views/notification_view.ex
index 83914a275..463d31d1a 100644
--- a/lib/pleroma/web/mastodon_api/views/notification_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/notification_view.ex
@@ -17,7 +17,11 @@ defmodule Pleroma.Web.MastodonAPI.NotificationView do
   alias Pleroma.Web.MastodonAPI.NotificationView
   alias Pleroma.Web.MastodonAPI.StatusView
 
-  @parent_types ~w{Like Announce EmojiReact}
+  defp object_id_for(%{data: %{"object" => %{"id" => id}}}) when is_binary(id), do: id
+
+  defp object_id_for(%{data: %{"object" => id}}) when is_binary(id), do: id
+
+  @parent_types ~w{Like Announce EmojiReact Update}
 
   def render("index.json", %{notifications: notifications, for: reading_user} = opts) do
     activities = Enum.map(notifications, & &1.activity)
@@ -28,7 +32,7 @@ def render("index.json", %{notifications: notifications, for: reading_user} = op
         %{data: %{"type" => type}} ->
           type in @parent_types
       end)
-      |> Enum.map(& &1.data["object"])
+      |> Enum.map(&object_id_for/1)
       |> Activity.create_by_object_ap_id()
       |> Activity.with_preloaded_object(:left)
       |> Pleroma.Repo.all()
@@ -76,9 +80,9 @@ def render(
 
     parent_activity_fn = fn ->
       if opts[:parent_activities] do
-        Activity.Queries.find_by_object_ap_id(opts[:parent_activities], activity.data["object"])
+        Activity.Queries.find_by_object_ap_id(opts[:parent_activities], object_id_for(activity))
       else
-        Activity.get_create_by_object_ap_id(activity.data["object"])
+        Activity.get_create_by_object_ap_id(object_id_for(activity))
       end
     end
 
@@ -107,6 +111,9 @@ def render(
       "reblog" ->
         put_status(response, parent_activity_fn.(), reading_user, status_render_opts)
 
+      "update" ->
+        put_status(response, parent_activity_fn.(), reading_user, status_render_opts)
+
       "move" ->
         put_target(response, activity, reading_user, %{})
 
diff --git a/test/pleroma/web/mastodon_api/views/notification_view_test.exs b/test/pleroma/web/mastodon_api/views/notification_view_test.exs
index 803b1f438..64d2c8a2e 100644
--- a/test/pleroma/web/mastodon_api/views/notification_view_test.exs
+++ b/test/pleroma/web/mastodon_api/views/notification_view_test.exs
@@ -285,6 +285,32 @@ test "Report notification" do
     test_notifications_rendering([notification], moderator_user, [expected])
   end
 
+  test "Edit notification" do
+    user = insert(:user)
+    repeat_user = insert(:user)
+
+    {:ok, activity} = CommonAPI.post(user, %{status: "mew"})
+    {:ok, _} = CommonAPI.repeat(activity.id, repeat_user)
+    {:ok, update} = CommonAPI.update(user, activity, %{status: "mew mew"})
+
+    user = Pleroma.User.get_by_ap_id(user.ap_id)
+    activity = Pleroma.Activity.normalize(activity)
+    update = Pleroma.Activity.normalize(update)
+
+    {:ok, [notification]} = Notification.create_notifications(update)
+
+    expected = %{
+      id: to_string(notification.id),
+      pleroma: %{is_seen: false, is_muted: false},
+      type: "update",
+      account: AccountView.render("show.json", %{user: user, for: repeat_user}),
+      created_at: Utils.to_masto_date(notification.inserted_at),
+      status: StatusView.render("show.json", %{activity: activity, for: repeat_user})
+    }
+
+    test_notifications_rendering([notification], repeat_user, [expected])
+  end
+
   test "muted notification" do
     user = insert(:user)
     another_user = insert(:user)
-- 
2.43.0


From c3fc04cdaac1c632f6e627e591a5d6a13e1fd668 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sun, 5 Jun 2022 16:35:01 -0400
Subject: [PATCH 17/48] Lint

---
 lib/pleroma/notification.ex | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/lib/pleroma/notification.ex b/lib/pleroma/notification.ex
index e62ae0ec9..593448713 100644
--- a/lib/pleroma/notification.ex
+++ b/lib/pleroma/notification.ex
@@ -506,7 +506,16 @@ def create_poll_notifications(%Activity{} = activity) do
   def get_notified_from_activity(activity, local_only \\ true)
 
   def get_notified_from_activity(%Activity{data: %{"type" => type}} = activity, local_only)
-      when type in ["Create", "Like", "Announce", "Follow", "Move", "EmojiReact", "Flag", "Update"] do
+      when type in [
+             "Create",
+             "Like",
+             "Announce",
+             "Follow",
+             "Move",
+             "EmojiReact",
+             "Flag",
+             "Update"
+           ] do
     potential_receiver_ap_ids = get_potential_receiver_ap_ids(activity)
 
     potential_receivers =
-- 
2.43.0


From 0d72051aa331d5014b8bef1dc3a2bcd8fd4204ed Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Wed, 8 Jun 2022 11:05:48 -0400
Subject: [PATCH 18/48] Add object id to uploaded attachments

---
 lib/pleroma/upload.ex        |  2 ++
 test/pleroma/upload_test.exs | 30 ++++++++++++++++--------------
 2 files changed, 18 insertions(+), 14 deletions(-)

diff --git a/lib/pleroma/upload.ex b/lib/pleroma/upload.ex
index 17822dc5e..9bf8e03df 100644
--- a/lib/pleroma/upload.ex
+++ b/lib/pleroma/upload.ex
@@ -36,6 +36,7 @@ defmodule Pleroma.Upload do
   alias Ecto.UUID
   alias Pleroma.Config
   alias Pleroma.Maps
+  alias Pleroma.Web.ActivityPub.Utils
   require Logger
 
   @type source ::
@@ -88,6 +89,7 @@ def store(upload, opts \\ []) do
          {:ok, url_spec} <- Pleroma.Uploaders.Uploader.put_file(opts.uploader, upload) do
       {:ok,
        %{
+         "id" => Utils.generate_object_id(),
          "type" => opts.activity_type,
          "mediaType" => upload.content_type,
          "url" => [
diff --git a/test/pleroma/upload_test.exs b/test/pleroma/upload_test.exs
index f1ab82a57..8f242630f 100644
--- a/test/pleroma/upload_test.exs
+++ b/test/pleroma/upload_test.exs
@@ -49,20 +49,22 @@ def put_file(upload), do: TestUploaderBase.put_file(upload, __MODULE__)
     test "it returns file" do
       File.cp!("test/fixtures/image.jpg", "test/fixtures/image_tmp.jpg")
 
-      assert Upload.store(@upload_file) ==
-               {:ok,
-                %{
-                  "name" => "image.jpg",
-                  "type" => "Document",
-                  "mediaType" => "image/jpeg",
-                  "url" => [
-                    %{
-                      "href" => "http://localhost:4001/media/post-process-file.jpg",
-                      "mediaType" => "image/jpeg",
-                      "type" => "Link"
-                    }
-                  ]
-                }}
+      assert {:ok, result} = Upload.store(@upload_file)
+
+      assert result ==
+               %{
+                 "id" => result["id"],
+                 "name" => "image.jpg",
+                 "type" => "Document",
+                 "mediaType" => "image/jpeg",
+                 "url" => [
+                   %{
+                     "href" => "http://localhost:4001/media/post-process-file.jpg",
+                     "mediaType" => "image/jpeg",
+                     "type" => "Link"
+                   }
+                 ]
+               }
 
       Task.await(Agent.get(TestUploaderSuccess, fn task_pid -> task_pid end))
     end
-- 
2.43.0


From 41a003d117841c366a47e26c8f0c51fa26742b08 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Wed, 8 Jun 2022 11:45:24 -0400
Subject: [PATCH 19/48] Return the corresponding object id in attachment view

---
 lib/pleroma/web/common_api/utils.ex           |  8 ++++++--
 .../web/mastodon_api/views/status_view.ex     | 13 +++++++++++--
 .../controllers/status_controller_test.exs    | 19 +++++++++++++++++++
 test/support/factory.ex                       | 12 ++++++++++++
 4 files changed, 48 insertions(+), 4 deletions(-)

diff --git a/lib/pleroma/web/common_api/utils.ex b/lib/pleroma/web/common_api/utils.ex
index 6058989a5..e17ea6929 100644
--- a/lib/pleroma/web/common_api/utils.ex
+++ b/lib/pleroma/web/common_api/utils.ex
@@ -37,7 +37,7 @@ def attachments_from_ids_no_descs([]), do: []
 
   def attachments_from_ids_no_descs(ids) do
     Enum.map(ids, fn media_id ->
-      case Repo.get(Object, media_id) do
+      case get_attachment(media_id) do
         %Object{data: data} -> data
         _ -> nil
       end
@@ -51,13 +51,17 @@ def attachments_from_ids_descs(ids, descs_str) do
     {_, descs} = Jason.decode(descs_str)
 
     Enum.map(ids, fn media_id ->
-      with %Object{data: data} <- Repo.get(Object, media_id) do
+      with %Object{data: data} <- get_attachment(media_id) do
         Map.put(data, "name", descs[media_id])
       end
     end)
     |> Enum.reject(&is_nil/1)
   end
 
+  defp get_attachment(media_id) do
+    Repo.get(Object, media_id)
+  end
+
   @spec get_to_and_cc(ActivityDraft.t()) :: {list(String.t()), list(String.t())}
 
   def get_to_and_cc(%{in_reply_to_conversation: %Participation{} = participation}) do
diff --git a/lib/pleroma/web/mastodon_api/views/status_view.ex b/lib/pleroma/web/mastodon_api/views/status_view.ex
index 203bebca9..40f716c42 100644
--- a/lib/pleroma/web/mastodon_api/views/status_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/status_view.ex
@@ -529,10 +529,19 @@ def render("attachment.json", %{attachment: attachment}) do
         true -> "unknown"
       end
 
-    <<hash_id::signed-32, _rest::binary>> = :crypto.hash(:md5, href)
+    attachment_id =
+      with {_, ap_id} when is_binary(ap_id) <- {:ap_id, attachment["id"]},
+           {_, %Object{data: _object_data, id: object_id}} <-
+             {:object, Object.get_by_ap_id(ap_id)} do
+        to_string(object_id)
+      else
+        _ ->
+          <<hash_id::signed-32, _rest::binary>> = :crypto.hash(:md5, href)
+          to_string(attachment["id"] || hash_id)
+      end
 
     %{
-      id: to_string(attachment["id"] || hash_id),
+      id: attachment_id,
       url: href,
       remote_url: href,
       preview_url: href_preview,
diff --git a/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs b/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
index 065d9e767..193375cd3 100644
--- a/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
+++ b/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
@@ -2129,6 +2129,25 @@ test "it updates the status", %{conn: conn, user: user} do
       assert response["spoiler_text"] == "lol"
     end
 
+    test "it updates the attachments", %{conn: conn, user: user} do
+      attachment = insert(:attachment, user: user)
+      attachment_id = to_string(attachment.id)
+
+      {:ok, activity} = CommonAPI.post(user, %{status: "mew mew #abc", spoiler_text: "#def"})
+
+      response =
+        conn
+        |> put_req_header("content-type", "application/json")
+        |> put("/api/v1/statuses/#{activity.id}", %{
+          "status" => "mew mew #abc",
+          "spoiler_text" => "#def",
+          "media_ids" => [attachment_id]
+        })
+        |> json_response_and_validate_schema(200)
+
+      assert [%{"id" => ^attachment_id}] = response["media_attachments"]
+    end
+
     test "it does not update visibility", %{conn: conn, user: user} do
       {:ok, activity} =
         CommonAPI.post(user, %{
diff --git a/test/support/factory.ex b/test/support/factory.ex
index 64d983663..6695886dc 100644
--- a/test/support/factory.ex
+++ b/test/support/factory.ex
@@ -111,6 +111,18 @@ def note_factory(attrs \\ %{}) do
     }
   end
 
+  def attachment_factory(attrs \\ %{}) do
+    user = attrs[:user] || insert(:user)
+
+    data =
+      attachment_data(user.ap_id, nil)
+      |> Map.put("id", Pleroma.Web.ActivityPub.Utils.generate_object_id())
+
+    %Pleroma.Object{
+      data: merge_attributes(data, Map.get(attrs, :data, %{}))
+    }
+  end
+
   def attachment_note_factory(attrs \\ %{}) do
     user = attrs[:user] || insert(:user)
     {length, attrs} = Map.pop(attrs, :length, 1)
-- 
2.43.0


From 670cbc368a6a9e375c41d3271c50a6909490cd51 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Thu, 9 Jun 2022 11:39:51 -0400
Subject: [PATCH 20/48] Fix incorrectly cached content after editing

---
 lib/pleroma/activity/html.ex                  | 36 ++++++++++++++++
 lib/pleroma/application.ex                    |  1 +
 lib/pleroma/web/activity_pub/side_effects.ex  | 25 +++++++----
 .../web/mastodon_api/views/status_view.ex     | 41 ++++++++++++++++---
 .../controllers/status_controller_test.exs    | 16 +++++++-
 test/pleroma/web/metadata/utils_test.exs      | 16 +++++++-
 6 files changed, 119 insertions(+), 16 deletions(-)

diff --git a/lib/pleroma/activity/html.ex b/lib/pleroma/activity/html.ex
index 0bf393836..30409d93d 100644
--- a/lib/pleroma/activity/html.ex
+++ b/lib/pleroma/activity/html.ex
@@ -8,6 +8,40 @@ defmodule Pleroma.Activity.HTML do
 
   @cachex Pleroma.Config.get([:cachex, :provider], Cachex)
 
+  # We store a list of cache keys related to an activity in a
+  # separate cache, scrubber_management_cache. It has the same
+  # size as scrubber_cache (see application.ex). Every time we add
+  # a cache to scrubber_cache, we update scrubber_management_cache.
+  #
+  # The most recent write of a certain key in the management cache
+  # is the same as the most recent write of any record related to that
+  # key in the main cache.
+  # Assuming LRW ( https://hexdocs.pm/cachex/Cachex.Policy.LRW.html ),
+  # this means when the management cache is evicted by cachex, all
+  # related records in the main cache will also have been evicted.
+
+  defp get_cache_keys_for(activity_id) do
+    with {:ok, list} when is_list(list) <- @cachex.get(:scrubber_management_cache, activity_id) do
+      list
+    else
+      _ -> []
+    end
+  end
+
+  defp add_cache_key_for(activity_id, additional_key) do
+    current = get_cache_keys_for(activity_id)
+
+    unless additional_key in current do
+      @cachex.put(:scrubber_management_cache, activity_id, [additional_key | current])
+    end
+  end
+
+  def invalidate_cache_for(activity_id) do
+    keys = get_cache_keys_for(activity_id)
+    Enum.map(keys, &@cachex.del(:scrubber_cache, &1))
+    @cachex.del(:scrubber_management_cache, activity_id)
+  end
+
   def get_cached_scrubbed_html_for_activity(
         content,
         scrubbers,
@@ -19,6 +53,8 @@ def get_cached_scrubbed_html_for_activity(
 
     @cachex.fetch!(:scrubber_cache, key, fn _key ->
       object = Object.normalize(activity, fetch: false)
+
+      add_cache_key_for(activity.id, key)
       HTML.ensure_scrubbed_html(content, scrubbers, object.data["fake"] || false, callback)
     end)
   end
diff --git a/lib/pleroma/application.ex b/lib/pleroma/application.ex
index e29bf3ca3..dae0e62ed 100644
--- a/lib/pleroma/application.ex
+++ b/lib/pleroma/application.ex
@@ -149,6 +149,7 @@ defp cachex_children do
       build_cachex("object", default_ttl: 25_000, ttl_interval: 1000, limit: 2500),
       build_cachex("rich_media", default_ttl: :timer.minutes(120), limit: 5000),
       build_cachex("scrubber", limit: 2500),
+      build_cachex("scrubber_management", limit: 2500),
       build_cachex("idempotency", expiration: idempotency_expiration(), limit: 2500),
       build_cachex("web_resp", limit: 2500),
       build_cachex("emoji_packs", expiration: emoji_packs_expiration(), limit: 10),
diff --git a/lib/pleroma/web/activity_pub/side_effects.ex b/lib/pleroma/web/activity_pub/side_effects.ex
index 5d7b9165a..1e1570e33 100644
--- a/lib/pleroma/web/activity_pub/side_effects.ex
+++ b/lib/pleroma/web/activity_pub/side_effects.ex
@@ -460,7 +460,8 @@ defp handle_update_object(
          %{data: %{"type" => "Update", "object" => updated_object}} = object,
          meta
        ) do
-    orig_object = Object.get_by_ap_id(updated_object["id"])
+    orig_object_ap_id = updated_object["id"]
+    orig_object = Object.get_by_ap_id(orig_object_ap_id)
     orig_object_data = orig_object.data
 
     if orig_object_data["type"] in @updatable_object_types do
@@ -473,15 +474,21 @@ defp handle_update_object(
         |> Object.maybe_update_history(orig_object_data, updated)
         |> maybe_update_poll(updated_object)
 
-      orig_object
-      |> Repo.preload(:hashtags)
-      |> Object.change(%{data: updated_object_data})
-      |> Object.update_and_set_cache()
+      changeset =
+        orig_object
+        |> Repo.preload(:hashtags)
+        |> Object.change(%{data: updated_object_data})
 
-      if updated do
-        object
-        |> Activity.normalize()
-        |> ActivityPub.notify_and_stream()
+      with {:ok, new_object} <- Repo.update(changeset),
+           {:ok, _} <- Object.invalid_object_cache(new_object),
+           {:ok, _} <- Object.set_cache(new_object),
+           # The metadata/utils.ex uses the object id for the cache.
+           {:ok, _} <- Pleroma.Activity.HTML.invalidate_cache_for(new_object.id) do
+        if updated do
+          object
+          |> Activity.normalize()
+          |> ActivityPub.notify_and_stream()
+        end
       end
     end
 
diff --git a/lib/pleroma/web/mastodon_api/views/status_view.ex b/lib/pleroma/web/mastodon_api/views/status_view.ex
index 40f716c42..f0d20ebfe 100644
--- a/lib/pleroma/web/mastodon_api/views/status_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/status_view.ex
@@ -271,6 +271,16 @@ def render("show.json", %{activity: %{data: %{"object" => _object}} = activity}
 
     reply_to_user = reply_to && CommonAPI.get_user(reply_to.data["actor"])
 
+    history_len =
+      1 +
+        (Object.history_for(object.data)
+         |> Map.get("orderedItems")
+         |> length())
+
+    # See render("history.json", ...) for more details
+    # Here the implicit index of the current content is 0
+    chrono_order = history_len - 1
+
     content =
       object
       |> render_content()
@@ -280,14 +290,14 @@ def render("show.json", %{activity: %{data: %{"object" => _object}} = activity}
       |> Activity.HTML.get_cached_scrubbed_html_for_activity(
         User.html_filter_policy(opts[:for]),
         activity,
-        "mastoapi:content"
+        "mastoapi:content:#{chrono_order}"
       )
 
     content_plaintext =
       content
       |> Activity.HTML.get_cached_stripped_html_for_activity(
         activity,
-        "mastoapi:content"
+        "mastoapi:content:#{chrono_order}"
       )
 
     summary = object.data["summary"] || ""
@@ -416,9 +426,25 @@ def render("history.json", %{activity: %{data: %{"object" => _object}} = activit
 
     history = [object | past_history]
 
+    history_len = length(history)
+
+    history =
+      Enum.with_index(
+        history,
+        fn object, index ->
+          %{
+            # The history is prepended every time there is a new edit.
+            # In chrono_order, the oldest item is always at 0, and so on.
+            # The chrono_order is an invariant kept between edits.
+            chrono_order: history_len - 1 - index,
+            object: object
+          }
+        end
+      )
+
     individual_opts =
       opts
-      |> Map.put(:as, :object)
+      |> Map.put(:as, :item)
       |> Map.put(:user, user)
       |> Map.put(:hashtags, hashtags)
 
@@ -427,7 +453,12 @@ def render("history.json", %{activity: %{data: %{"object" => _object}} = activit
 
   def render(
         "history_item.json",
-        %{activity: activity, user: user, object: object, hashtags: hashtags} = opts
+        %{
+          activity: activity,
+          user: user,
+          item: %{object: object, chrono_order: chrono_order},
+          hashtags: hashtags
+        } = opts
       ) do
     sensitive = object.data["sensitive"] || Enum.member?(hashtags, "nsfw")
 
@@ -445,7 +476,7 @@ def render(
       |> Activity.HTML.get_cached_scrubbed_html_for_activity(
         User.html_filter_policy(opts[:for]),
         activity,
-        "mastoapi:content"
+        "mastoapi:content:#{chrono_order}"
       )
 
     summary = object.data["summary"] || ""
diff --git a/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs b/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
index 193375cd3..c9daf771b 100644
--- a/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
+++ b/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
@@ -2113,9 +2113,15 @@ test "it returns the source", %{conn: conn} do
       oauth_access(["write:statuses"])
     end
 
-    test "it updates the status", %{conn: conn, user: user} do
+    test "it updates the status" do
+      %{conn: conn, user: user} = oauth_access(["write:statuses", "read:statuses"])
+
       {:ok, activity} = CommonAPI.post(user, %{status: "mew mew #abc", spoiler_text: "#def"})
 
+      conn
+      |> get("/api/v1/statuses/#{activity.id}")
+      |> json_response_and_validate_schema(200)
+
       response =
         conn
         |> put_req_header("content-type", "application/json")
@@ -2127,6 +2133,14 @@ test "it updates the status", %{conn: conn, user: user} do
 
       assert response["content"] == "edited"
       assert response["spoiler_text"] == "lol"
+
+      response =
+        conn
+        |> get("/api/v1/statuses/#{activity.id}")
+        |> json_response_and_validate_schema(200)
+
+      assert response["content"] == "edited"
+      assert response["spoiler_text"] == "lol"
     end
 
     test "it updates the attachments", %{conn: conn, user: user} do
diff --git a/test/pleroma/web/metadata/utils_test.exs b/test/pleroma/web/metadata/utils_test.exs
index 074bd2e2f..c99d11596 100644
--- a/test/pleroma/web/metadata/utils_test.exs
+++ b/test/pleroma/web/metadata/utils_test.exs
@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.Metadata.UtilsTest do
-  use Pleroma.DataCase, async: true
+  use Pleroma.DataCase, async: false
   import Pleroma.Factory
   alias Pleroma.Web.Metadata.Utils
 
@@ -22,6 +22,20 @@ test "it returns text without encode HTML" do
 
       assert Utils.scrub_html_and_truncate(note) == "Pleroma's really cool!"
     end
+
+    test "it does not return old content after editing" do
+      user = insert(:user)
+
+      {:ok, activity} = Pleroma.Web.CommonAPI.post(user, %{status: "mew mew #def"})
+
+      object = Pleroma.Object.normalize(activity)
+      assert Utils.scrub_html_and_truncate(object) == "mew mew #def"
+
+      {:ok, update} = Pleroma.Web.CommonAPI.update(user, activity, %{status: "mew mew #abc"})
+      update = Pleroma.Activity.normalize(update)
+      object = Pleroma.Object.normalize(update)
+      assert Utils.scrub_html_and_truncate(object) == "mew mew #abc"
+    end
   end
 
   describe "scrub_html_and_truncate/2" do
-- 
2.43.0


From edbe714435d40117a1f6c80595998ebd0ee8f8be Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sat, 11 Jun 2022 10:35:36 -0400
Subject: [PATCH 21/48] Expose history and source apis to anon users

---
 .../web/mastodon_api/controllers/status_controller.ex  | 10 ++++++----
 lib/pleroma/web/router.ex                              |  4 ++--
 .../controllers/status_controller_test.exs             |  4 ++--
 3 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/lib/pleroma/web/mastodon_api/controllers/status_controller.ex b/lib/pleroma/web/mastodon_api/controllers/status_controller.ex
index 648e7bad6..0fa20a53c 100644
--- a/lib/pleroma/web/mastodon_api/controllers/status_controller.ex
+++ b/lib/pleroma/web/mastodon_api/controllers/status_controller.ex
@@ -194,8 +194,9 @@ def create(%{assigns: %{user: _user}, body_params: %{media_ids: _} = params} = c
   end
 
   @doc "GET /api/v1/statuses/:id/history"
-  def show_history(%{assigns: %{user: user}} = conn, %{id: id} = params) do
-    with %Activity{} = activity <- Activity.get_by_id_with_object(id),
+  def show_history(%{assigns: assigns} = conn, %{id: id} = params) do
+    with user = assigns[:user],
+         %Activity{} = activity <- Activity.get_by_id_with_object(id),
          true <- Visibility.visible_for_user?(activity, user) do
       try_render(conn, "history.json",
         activity: activity,
@@ -209,8 +210,9 @@ def show_history(%{assigns: %{user: user}} = conn, %{id: id} = params) do
   end
 
   @doc "GET /api/v1/statuses/:id/source"
-  def show_source(%{assigns: %{user: user}} = conn, %{id: id} = _params) do
-    with %Activity{} = activity <- Activity.get_by_id_with_object(id),
+  def show_source(%{assigns: assigns} = conn, %{id: id} = _params) do
+    with user = assigns[:user],
+         %Activity{} = activity <- Activity.get_by_id_with_object(id),
          true <- Visibility.visible_for_user?(activity, user) do
       try_render(conn, "source.json",
         activity: activity,
diff --git a/lib/pleroma/web/router.ex b/lib/pleroma/web/router.ex
index 81fbc9f6f..bb4fa4ecf 100644
--- a/lib/pleroma/web/router.ex
+++ b/lib/pleroma/web/router.ex
@@ -537,8 +537,6 @@ defmodule Pleroma.Web.Router do
     get("/bookmarks", StatusController, :bookmarks)
 
     post("/statuses", StatusController, :create)
-    get("/statuses/:id/history", StatusController, :show_history)
-    get("/statuses/:id/source", StatusController, :show_source)
     put("/statuses/:id", StatusController, :update)
     delete("/statuses/:id", StatusController, :delete)
     post("/statuses/:id/reblog", StatusController, :reblog)
@@ -604,6 +602,8 @@ defmodule Pleroma.Web.Router do
     get("/statuses/:id/context", StatusController, :context)
     get("/statuses/:id/favourited_by", StatusController, :favourited_by)
     get("/statuses/:id/reblogged_by", StatusController, :reblogged_by)
+    get("/statuses/:id/history", StatusController, :show_history)
+    get("/statuses/:id/source", StatusController, :show_source)
 
     get("/custom_emojis", CustomEmojiController, :index)
 
diff --git a/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs b/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
index c9daf771b..bdc5369f9 100644
--- a/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
+++ b/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
@@ -2045,7 +2045,7 @@ test "posting a quote of a status that doesn't exist", %{conn: conn} do
 
   describe "get status history" do
     setup do
-      oauth_access(["read:statuses"])
+      %{conn: build_conn()}
     end
 
     test "unedited post", %{conn: conn} do
@@ -2091,7 +2091,7 @@ test "edited post", %{conn: conn} do
 
   describe "get status source" do
     setup do
-      oauth_access(["read:statuses"])
+      %{conn: build_conn()}
     end
 
     test "it returns the source", %{conn: conn} do
-- 
2.43.0


From 2e8ddd5e21833584115024f5eaaab4211ca8a436 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sat, 11 Jun 2022 12:02:16 -0400
Subject: [PATCH 22/48] Send the correct update in streamer

get_create_by_ap_id_with_object() seems to fetch the old object.
Why this happens needs further investigation.
---
 lib/pleroma/web/streamer.ex            |  8 ++++--
 lib/pleroma/web/views/streamer_view.ex |  4 ---
 test/pleroma/web/streamer_test.exs     | 37 +++++++++++++++++++++++---
 3 files changed, 39 insertions(+), 10 deletions(-)

diff --git a/lib/pleroma/web/streamer.ex b/lib/pleroma/web/streamer.ex
index 3d7798b9c..1958aed54 100644
--- a/lib/pleroma/web/streamer.ex
+++ b/lib/pleroma/web/streamer.ex
@@ -283,12 +283,16 @@ defp push_to_socket(topic, %Activity{
   defp push_to_socket(_topic, %Activity{data: %{"type" => "Delete"}}), do: :noop
 
   defp push_to_socket(topic, %Activity{data: %{"type" => "Update"}} = item) do
-    anon_render = StreamerView.render("status_update.json", item)
+    create_activity =
+      Pleroma.Activity.get_create_by_object_ap_id(item.object.data["id"])
+      |> Map.put(:object, item.object)
+
+    anon_render = StreamerView.render("status_update.json", create_activity)
 
     Registry.dispatch(@registry, topic, fn list ->
       Enum.each(list, fn {pid, auth?} ->
         if auth? do
-          send(pid, {:render_with_user, StreamerView, "status_update.json", item})
+          send(pid, {:render_with_user, StreamerView, "status_update.json", create_activity})
         else
           send(pid, {:text, anon_render})
         end
diff --git a/lib/pleroma/web/views/streamer_view.ex b/lib/pleroma/web/views/streamer_view.ex
index ad278f2f4..68b19d6d7 100644
--- a/lib/pleroma/web/views/streamer_view.ex
+++ b/lib/pleroma/web/views/streamer_view.ex
@@ -26,8 +26,6 @@ def render("update.json", %Activity{} = activity, %User{} = user) do
   end
 
   def render("status_update.json", %Activity{} = activity, %User{} = user) do
-    activity = Activity.get_create_by_object_ap_id_with_object(activity.object.data["id"])
-
     %{
       event: "status.update",
       payload:
@@ -68,8 +66,6 @@ def render("update.json", %Activity{} = activity) do
   end
 
   def render("status_update.json", %Activity{} = activity) do
-    activity = Activity.get_create_by_object_ap_id_with_object(activity.object.data["id"])
-
     %{
       event: "status.update",
       payload:
diff --git a/test/pleroma/web/streamer_test.exs b/test/pleroma/web/streamer_test.exs
index 1fc35dcc5..a2a9bacd5 100644
--- a/test/pleroma/web/streamer_test.exs
+++ b/test/pleroma/web/streamer_test.exs
@@ -383,9 +383,9 @@ test "it streams edits in the 'user' stream", %{user: user, token: oauth_token}
 
       Streamer.get_topic_and_add_socket("user", user, oauth_token)
       {:ok, edited} = CommonAPI.update(sender, activity, %{status: "mew mew"})
-      edited = Pleroma.Activity.normalize(edited)
+      create = Pleroma.Activity.get_create_by_object_ap_id_with_object(activity.object.data["id"])
 
-      assert_receive {:render_with_user, _, "status_update.json", ^edited}
+      assert_receive {:render_with_user, _, "status_update.json", ^create}
       refute Streamer.filtered_by_user?(user, edited)
     end
 
@@ -394,9 +394,9 @@ test "it streams own edits in the 'user' stream", %{user: user, token: oauth_tok
 
       Streamer.get_topic_and_add_socket("user", user, oauth_token)
       {:ok, edited} = CommonAPI.update(user, activity, %{status: "mew mew"})
-      edited = Pleroma.Activity.normalize(edited)
+      create = Pleroma.Activity.get_create_by_object_ap_id_with_object(activity.object.data["id"])
 
-      assert_receive {:render_with_user, _, "status_update.json", ^edited}
+      assert_receive {:render_with_user, _, "status_update.json", ^create}
       refute Streamer.filtered_by_user?(user, edited)
     end
   end
@@ -460,6 +460,35 @@ test "it streams edits in the 'public' stream" do
       assert %{"id" => ^activity_id} = Jason.decode!(payload)
       refute Streamer.filtered_by_user?(sender, edited)
     end
+
+    test "it streams multiple edits in the 'public' stream correctly" do
+      sender = insert(:user)
+
+      Streamer.get_topic_and_add_socket("public", nil, nil)
+      {:ok, activity} = CommonAPI.post(sender, %{status: "hey"})
+      assert_receive {:text, _}
+
+      {:ok, edited} = CommonAPI.update(sender, activity, %{status: "mew mew"})
+
+      edited = Pleroma.Activity.normalize(edited)
+
+      %{id: activity_id} = Pleroma.Activity.get_create_by_object_ap_id(edited.object.data["id"])
+
+      assert_receive {:text, event}
+      assert %{"event" => "status.update", "payload" => payload} = Jason.decode!(event)
+      assert %{"id" => ^activity_id} = Jason.decode!(payload)
+      refute Streamer.filtered_by_user?(sender, edited)
+
+      {:ok, edited} = CommonAPI.update(sender, activity, %{status: "mew mew 2"})
+
+      edited = Pleroma.Activity.normalize(edited)
+
+      %{id: activity_id} = Pleroma.Activity.get_create_by_object_ap_id(edited.object.data["id"])
+      assert_receive {:text, event}
+      assert %{"event" => "status.update", "payload" => payload} = Jason.decode!(event)
+      assert %{"id" => ^activity_id, "content" => "mew mew 2"} = Jason.decode!(payload)
+      refute Streamer.filtered_by_user?(sender, edited)
+    end
   end
 
   describe "thread_containment/2" do
-- 
2.43.0


From bcb70dca4f15f665dfa1dab767df8dcf1b42b83e Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sat, 11 Jun 2022 16:28:59 -0400
Subject: [PATCH 23/48] Workaround with_index does not support function in
 Elixir 1.9

---
 .../web/mastodon_api/views/status_view.ex     | 22 +++++++++----------
 1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/lib/pleroma/web/mastodon_api/views/status_view.ex b/lib/pleroma/web/mastodon_api/views/status_view.ex
index f0d20ebfe..574ebc1a4 100644
--- a/lib/pleroma/web/mastodon_api/views/status_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/status_view.ex
@@ -429,18 +429,16 @@ def render("history.json", %{activity: %{data: %{"object" => _object}} = activit
     history_len = length(history)
 
     history =
-      Enum.with_index(
-        history,
-        fn object, index ->
-          %{
-            # The history is prepended every time there is a new edit.
-            # In chrono_order, the oldest item is always at 0, and so on.
-            # The chrono_order is an invariant kept between edits.
-            chrono_order: history_len - 1 - index,
-            object: object
-          }
-        end
-      )
+      Enum.zip(history_len..0, history)
+      |> Enum.map(fn {chrono_order, object} ->
+        %{
+          # The history is prepended every time there is a new edit.
+          # In chrono_order, the oldest item is always at 0, and so on.
+          # The chrono_order is an invariant kept between edits.
+          chrono_order: chrono_order,
+          object: object
+        }
+      end)
 
     individual_opts =
       opts
-- 
2.43.0


From 97e9484e550458ccfae776e1a26fbec3754bb1b4 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sat, 11 Jun 2022 19:52:07 -0400
Subject: [PATCH 24/48] Show original status at the first of history

---
 lib/pleroma/web/mastodon_api/views/status_view.ex     | 11 +++++------
 .../controllers/status_controller_test.exs            |  2 +-
 2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/lib/pleroma/web/mastodon_api/views/status_view.ex b/lib/pleroma/web/mastodon_api/views/status_view.ex
index 574ebc1a4..6c58e9bae 100644
--- a/lib/pleroma/web/mastodon_api/views/status_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/status_view.ex
@@ -424,13 +424,12 @@ def render("history.json", %{activity: %{data: %{"object" => _object}} = activit
       |> Enum.map(&Map.put(&1, "id", object.data["id"]))
       |> Enum.map(&%Object{data: &1, id: object.id})
 
-    history = [object | past_history]
-
-    history_len = length(history)
-
     history =
-      Enum.zip(history_len..0, history)
-      |> Enum.map(fn {chrono_order, object} ->
+      [object | past_history]
+      # Mastodon expects the original to be at the first
+      |> Enum.reverse()
+      |> Enum.with_index()
+      |> Enum.map(fn {object, chrono_order} ->
         %{
           # The history is prepended every time there is a new edit.
           # In chrono_order, the oldest item is always at 0, and so on.
diff --git a/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs b/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
index bdc5369f9..2cee46cb3 100644
--- a/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
+++ b/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
@@ -2084,7 +2084,7 @@ test "edited post", %{conn: conn} do
 
       conn = get(conn, "/api/v1/statuses/#{activity.id}/history")
 
-      assert [_, %{"spoiler_text" => "title 2"}, %{"spoiler_text" => "title 1"}] =
+      assert [%{"spoiler_text" => "title 1"}, %{"spoiler_text" => "title 2"}, _] =
                json_response_and_validate_schema(conn, 200)
     end
   end
-- 
2.43.0


From ab56283cc570cf5ece13ad55ce36e873ccff7c4c Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Tue, 21 Jun 2022 12:32:44 -0400
Subject: [PATCH 25/48] Add editing to features

---
 lib/pleroma/web/mastodon_api/views/instance_view.ex | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/pleroma/web/mastodon_api/views/instance_view.ex b/lib/pleroma/web/mastodon_api/views/instance_view.ex
index 4cfa8d85c..3f72c01de 100644
--- a/lib/pleroma/web/mastodon_api/views/instance_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/instance_view.ex
@@ -65,6 +65,7 @@ def features do
       "shareable_emoji_packs",
       "multifetch",
       "pleroma:api/v1/notifications:include_types_filter",
+      "editing",
       if Config.get([:media_proxy, :enabled]) do
         "media_proxy"
       end,
-- 
2.43.0


From 19f5f7c3f05e996c5fc2c6d330b8c0a6d730e3ea Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Fri, 24 Jun 2022 10:10:22 -0400
Subject: [PATCH 26/48] Convert incoming Updated object into Pleroma format

---
 .../web/activity_pub/object_validator.ex      | 16 +++++++++
 .../article_note_page_validator.ex            |  5 ++-
 .../article_note_page_validator_test.exs      |  5 +++
 .../update_handling_test.exs                  | 35 ++++++++++++++++++-
 4 files changed, 59 insertions(+), 2 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/object_validator.ex b/lib/pleroma/web/activity_pub/object_validator.ex
index 283cd884c..3c52fe311 100644
--- a/lib/pleroma/web/activity_pub/object_validator.ex
+++ b/lib/pleroma/web/activity_pub/object_validator.ex
@@ -124,6 +124,22 @@ def validate(%{"type" => type} = object, meta)
     end
   end
 
+  def validate(
+        %{"type" => "Update", "object" => %{"type" => objtype} = object} = update_activity,
+        meta
+      )
+      when objtype in ~w[Question Answer Audio Video Event Article Note Page] do
+    with {:ok, object_data} <- cast_and_apply(object),
+         meta = Keyword.put(meta, :object_data, object_data |> stringify_keys),
+         {:ok, update_activity} <-
+           update_activity
+           |> UpdateValidator.cast_and_validate()
+           |> Ecto.Changeset.apply_action(:insert) do
+      update_activity = stringify_keys(update_activity)
+      {:ok, update_activity, meta}
+    end
+  end
+
   def validate(%{"type" => type} = object, meta)
       when type in ~w[Accept Reject Follow Update Like EmojiReact Announce
       Answer] do
diff --git a/lib/pleroma/web/activity_pub/object_validators/article_note_page_validator.ex b/lib/pleroma/web/activity_pub/object_validators/article_note_page_validator.ex
index 5e377c294..4ce9428a7 100644
--- a/lib/pleroma/web/activity_pub/object_validators/article_note_page_validator.ex
+++ b/lib/pleroma/web/activity_pub/object_validators/article_note_page_validator.ex
@@ -54,7 +54,10 @@ defp fix_url(%{"url" => url} = data) when is_bitstring(url), do: data
   defp fix_url(%{"url" => url} = data) when is_map(url), do: Map.put(data, "url", url["href"])
   defp fix_url(data), do: data
 
-  defp fix_tag(%{"tag" => tag} = data) when is_list(tag), do: data
+  defp fix_tag(%{"tag" => tag} = data) when is_list(tag) do
+    Map.put(data, "tag", Enum.filter(tag, &is_map/1))
+  end
+
   defp fix_tag(%{"tag" => tag} = data) when is_map(tag), do: Map.put(data, "tag", [tag])
   defp fix_tag(data), do: Map.drop(data, ["tag"])
 
diff --git a/test/pleroma/web/activity_pub/object_validators/article_note_page_validator_test.exs b/test/pleroma/web/activity_pub/object_validators/article_note_page_validator_test.exs
index 8b3982916..2aed65e4a 100644
--- a/test/pleroma/web/activity_pub/object_validators/article_note_page_validator_test.exs
+++ b/test/pleroma/web/activity_pub/object_validators/article_note_page_validator_test.exs
@@ -38,6 +38,11 @@ test "a basic note validates", %{note: note} do
       %{valid?: true} = ArticleNotePageValidator.cast_and_validate(note)
     end
 
+    test "a note from factory validates" do
+      note = insert(:note)
+      %{valid?: true} = ArticleNotePageValidator.cast_and_validate(note.data)
+    end
+
     test "a note with a remote replies collection should validate", _ do
       insert(:user, %{ap_id: "https://bookwyrm.com/user/TestUser"})
       collection = File.read!("test/fixtures/bookwyrm-replies-collection.json")
diff --git a/test/pleroma/web/activity_pub/object_validators/update_handling_test.exs b/test/pleroma/web/activity_pub/object_validators/update_handling_test.exs
index 4aed0239d..2415355af 100644
--- a/test/pleroma/web/activity_pub/object_validators/update_handling_test.exs
+++ b/test/pleroma/web/activity_pub/object_validators/update_handling_test.exs
@@ -60,7 +60,40 @@ test "validates if the object is not of an Actor type" do
 
       {:ok, update, _} = Builder.update(other_user, updated_note)
 
-      assert {:ok, _update, []} = ObjectValidator.validate(update, [])
+      assert {:ok, _update, _} = ObjectValidator.validate(update, [])
+    end
+  end
+
+  describe "update note" do
+    test "converts object into Pleroma's format" do
+      mastodon_tags = [
+        %{
+          "icon" => %{
+            "mediaType" => "image/png",
+            "type" => "Image",
+            "url" => "https://somewhere.org/emoji/url/1.png"
+          },
+          "id" => "https://somewhere.org/emoji/1",
+          "name" => ":some_emoji:",
+          "type" => "Emoji",
+          "updated" => "2021-04-07T11:00:00Z"
+        }
+      ]
+
+      user = insert(:user)
+      note = insert(:note, user: user)
+
+      updated_note =
+        note.data
+        |> Map.put("content", "edited content")
+        |> Map.put("tag", mastodon_tags)
+
+      {:ok, update, _} = Builder.update(user, updated_note)
+
+      assert {:ok, _update, meta} = ObjectValidator.validate(update, [])
+
+      assert %{"emoji" => %{"some_emoji" => "https://somewhere.org/emoji/url/1.png"}} =
+               meta[:object_data]
     end
   end
 end
-- 
2.43.0


From 09fd030961dd810840c58f089439f98196475a22 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Fri, 24 Jun 2022 10:26:01 -0400
Subject: [PATCH 27/48] Use meta[:object_data] in SideEffects for Update

---
 lib/pleroma/web/activity_pub/side_effects.ex  |  2 +
 .../web/activity_pub/side_effects_test.exs    | 49 ++++++++++++++-----
 2 files changed, 39 insertions(+), 12 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/side_effects.ex b/lib/pleroma/web/activity_pub/side_effects.ex
index 1e1570e33..1c216ca38 100644
--- a/lib/pleroma/web/activity_pub/side_effects.ex
+++ b/lib/pleroma/web/activity_pub/side_effects.ex
@@ -464,6 +464,8 @@ defp handle_update_object(
     orig_object = Object.get_by_ap_id(orig_object_ap_id)
     orig_object_data = orig_object.data
 
+    updated_object = meta[:object_data]
+
     if orig_object_data["type"] in @updatable_object_types do
       %{data: updated_object_data, updated: updated} =
         orig_object_data
diff --git a/test/pleroma/web/activity_pub/side_effects_test.exs b/test/pleroma/web/activity_pub/side_effects_test.exs
index 9fb583dbf..d98fb38cf 100644
--- a/test/pleroma/web/activity_pub/side_effects_test.exs
+++ b/test/pleroma/web/activity_pub/side_effects_test.exs
@@ -159,21 +159,44 @@ test "it uses a given changeset to update", %{user: user, update: update} do
       {:ok, update_data, []} = Builder.update(user, updated_note)
       {:ok, update, _meta} = ActivityPub.persist(update_data, local: true)
 
-      %{user: user, note: note, object_id: note.id, update_data: update_data, update: update}
+      %{
+        user: user,
+        note: note,
+        object_id: note.id,
+        update_data: update_data,
+        update: update,
+        updated_note: updated_note
+      }
     end
 
-    test "it updates the note", %{object_id: object_id, update: update} do
-      {:ok, _, _} = SideEffects.handle(update)
+    test "it updates the note", %{
+      object_id: object_id,
+      update: update,
+      updated_note: updated_note
+    } do
+      {:ok, _, _} = SideEffects.handle(update, object_data: updated_note)
       new_note = Pleroma.Object.get_by_id(object_id)
       assert %{"summary" => "edited summary", "content" => "edited content"} = new_note.data
     end
 
+    test "it updates using object_data", %{
+      object_id: object_id,
+      update: update,
+      updated_note: updated_note
+    } do
+      updated_note = Map.put(updated_note, "summary", "mew mew")
+      {:ok, _, _} = SideEffects.handle(update, object_data: updated_note)
+      new_note = Pleroma.Object.get_by_id(object_id)
+      assert %{"summary" => "mew mew", "content" => "edited content"} = new_note.data
+    end
+
     test "it records the original note in formerRepresentations", %{
       note: note,
       object_id: object_id,
-      update: update
+      update: update,
+      updated_note: updated_note
     } do
-      {:ok, _, _} = SideEffects.handle(update)
+      {:ok, _, _} = SideEffects.handle(update, object_data: updated_note)
       %{data: new_note} = Pleroma.Object.get_by_id(object_id)
       assert %{"summary" => "edited summary", "content" => "edited content"} = new_note
 
@@ -187,9 +210,10 @@ test "it puts the original note at the front of formerRepresentations", %{
       user: user,
       note: note,
       object_id: object_id,
-      update: update
+      update: update,
+      updated_note: updated_note
     } do
-      {:ok, _, _} = SideEffects.handle(update)
+      {:ok, _, _} = SideEffects.handle(update, object_data: updated_note)
       %{data: first_edit} = Pleroma.Object.get_by_id(object_id)
 
       second_updated_note =
@@ -199,7 +223,7 @@ test "it puts the original note at the front of formerRepresentations", %{
 
       {:ok, second_update_data, []} = Builder.update(user, second_updated_note)
       {:ok, update, _meta} = ActivityPub.persist(second_update_data, local: true)
-      {:ok, _, _} = SideEffects.handle(update)
+      {:ok, _, _} = SideEffects.handle(update, object_data: second_updated_note)
       %{data: new_note} = Pleroma.Object.get_by_id(object_id)
       assert %{"summary" => "edited summary 2", "content" => "edited content 2"} = new_note
 
@@ -215,12 +239,13 @@ test "it puts the original note at the front of formerRepresentations", %{
     test "it does not prepend to formerRepresentations if no actual changes are made", %{
       note: note,
       object_id: object_id,
-      update: update
+      update: update,
+      updated_note: updated_note
     } do
-      {:ok, _, _} = SideEffects.handle(update)
+      {:ok, _, _} = SideEffects.handle(update, object_data: updated_note)
       %{data: _first_edit} = Pleroma.Object.get_by_id(object_id)
 
-      {:ok, _, _} = SideEffects.handle(update)
+      {:ok, _, _} = SideEffects.handle(update, object_data: updated_note)
       %{data: new_note} = Pleroma.Object.get_by_id(object_id)
       assert %{"summary" => "edited summary", "content" => "edited content"} = new_note
 
@@ -255,7 +280,7 @@ test "allows updating choice count without generating edit history", %{
       {:ok, update_data, []} = Builder.update(user, updated_question)
       {:ok, update, _meta} = ActivityPub.persist(update_data, local: true)
 
-      {:ok, _, _} = SideEffects.handle(update)
+      {:ok, _, _} = SideEffects.handle(update, object_data: updated_question)
 
       %{data: new_question} = Pleroma.Object.get_by_id(id)
 
-- 
2.43.0


From ccfcf15d4f51f633a692a5fb4fc60e531dd6df04 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Fri, 24 Jun 2022 10:54:11 -0400
Subject: [PATCH 28/48] Fix CommonAPITest

---
 .../web/activity_pub/object_validators/attachment_validator.ex | 3 ++-
 .../web/activity_pub/object_validators/common_fields.ex        | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/pleroma/web/activity_pub/object_validators/attachment_validator.ex b/lib/pleroma/web/activity_pub/object_validators/attachment_validator.ex
index ffdb16976..dba18a3d0 100644
--- a/lib/pleroma/web/activity_pub/object_validators/attachment_validator.ex
+++ b/lib/pleroma/web/activity_pub/object_validators/attachment_validator.ex
@@ -11,6 +11,7 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidators.AttachmentValidator do
 
   @primary_key false
   embedded_schema do
+    field(:id, :string)
     field(:type, :string)
     field(:mediaType, :string, default: "application/octet-stream")
     field(:name, :string)
@@ -43,7 +44,7 @@ def changeset(struct, data) do
       |> fix_url()
 
     struct
-    |> cast(data, [:type, :mediaType, :name, :blurhash])
+    |> cast(data, [:id, :type, :mediaType, :name, :blurhash])
     |> cast_embed(:url, with: &url_changeset/2, required: true)
     |> validate_inclusion(:type, ~w[Link Document Audio Image Video])
     |> validate_required([:type, :mediaType])
diff --git a/lib/pleroma/web/activity_pub/object_validators/common_fields.ex b/lib/pleroma/web/activity_pub/object_validators/common_fields.ex
index 1eaf572b9..46f609be0 100644
--- a/lib/pleroma/web/activity_pub/object_validators/common_fields.ex
+++ b/lib/pleroma/web/activity_pub/object_validators/common_fields.ex
@@ -33,6 +33,7 @@ defmacro object_fields do
       field(:content, :string)
 
       field(:published, ObjectValidators.DateTime)
+      field(:updated, ObjectValidators.DateTime)
       field(:emoji, ObjectValidators.Emoji, default: %{})
       embeds_many(:attachment, AttachmentValidator)
     end
-- 
2.43.0


From 57c130825b919d43e744de66a4c08a6dcb3100d9 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sat, 25 Jun 2022 00:32:22 -0400
Subject: [PATCH 29/48] Unify the logic of updating objects

---
 lib/pleroma/object.ex                         |  42 -----
 lib/pleroma/object/fetcher.ex                 |   9 +-
 lib/pleroma/object/updater.ex                 | 157 ++++++++++++++++++
 lib/pleroma/web/activity_pub/side_effects.ex  |  62 ++-----
 lib/pleroma/web/common_api.ex                 |  10 +-
 .../web/mastodon_api/views/status_view.ex     |   4 +-
 6 files changed, 183 insertions(+), 101 deletions(-)
 create mode 100644 lib/pleroma/object/updater.ex

diff --git a/lib/pleroma/object.ex b/lib/pleroma/object.ex
index 88fc28756..c3ea1b98b 100644
--- a/lib/pleroma/object.ex
+++ b/lib/pleroma/object.ex
@@ -425,46 +425,4 @@ def object_data_hashtags(%{"tag" => tags}) when is_list(tags) do
   end
 
   def object_data_hashtags(_), do: []
-
-  def history_for(object) do
-    with history <- Map.get(object, "formerRepresentations"),
-         true <- is_map(history),
-         "OrderedCollection" <- Map.get(history, "type"),
-         true <- is_list(Map.get(history, "orderedItems")),
-         true <- is_integer(Map.get(history, "totalItems")) do
-      history
-    else
-      _ -> history_skeleton()
-    end
-  end
-
-  defp history_skeleton do
-    %{
-      "type" => "OrderedCollection",
-      "totalItems" => 0,
-      "orderedItems" => []
-    }
-  end
-
-  def maybe_update_history(updated_object, orig_object_data, updated) do
-    if not updated do
-      updated_object
-    else
-      # Put edit history
-      # Note that we may have got the edit history by first fetching the object
-      history = Object.history_for(orig_object_data)
-
-      latest_history_item =
-        orig_object_data
-        |> Map.drop(["id", "formerRepresentations"])
-
-      new_history =
-        history
-        |> Map.put("orderedItems", [latest_history_item | history["orderedItems"]])
-        |> Map.put("totalItems", history["totalItems"] + 1)
-
-      updated_object
-      |> Map.put("formerRepresentations", new_history)
-    end
-  end
 end
diff --git a/lib/pleroma/object/fetcher.ex b/lib/pleroma/object/fetcher.ex
index 4289107e0..8ec28345f 100644
--- a/lib/pleroma/object/fetcher.ex
+++ b/lib/pleroma/object/fetcher.ex
@@ -50,7 +50,14 @@ defp maybe_reinject_internal_fields(%{data: %{} = old_data}, new_data) do
           Pleroma.Constants.status_updatable_fields()
           |> Enum.any?(fn field -> Map.get(old_data, field) != Map.get(new_data, field) end)
 
-        new_data |> Object.maybe_update_history(old_data, changed?)
+        %{updated_object: updated_object} =
+          new_data
+          |> Object.Updater.maybe_update_history(old_data,
+            updated: changed?,
+            use_history_in_new_object?: false
+          )
+
+        updated_object
       else
         new_data
       end
diff --git a/lib/pleroma/object/updater.ex b/lib/pleroma/object/updater.ex
new file mode 100644
index 000000000..03136c38e
--- /dev/null
+++ b/lib/pleroma/object/updater.ex
@@ -0,0 +1,157 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Object.Updater do
+  require Pleroma.Constants
+
+  def update_content_fields(orig_object_data, updated_object) do
+    Pleroma.Constants.status_updatable_fields()
+    |> Enum.reduce(
+      %{data: orig_object_data, updated: false},
+      fn field, %{data: data, updated: updated} ->
+        updated = updated or Map.get(updated_object, field) != Map.get(orig_object_data, field)
+
+        data =
+          if Map.has_key?(updated_object, field) do
+            Map.put(data, field, updated_object[field])
+          else
+            Map.drop(data, [field])
+          end
+
+        %{data: data, updated: updated}
+      end
+    )
+  end
+
+  def maybe_history(object) do
+    with history <- Map.get(object, "formerRepresentations"),
+         true <- is_map(history),
+         "OrderedCollection" <- Map.get(history, "type"),
+         true <- is_list(Map.get(history, "orderedItems")),
+         true <- is_integer(Map.get(history, "totalItems")) do
+      history
+    else
+      _ -> nil
+    end
+  end
+
+  def history_for(object) do
+    with history when not is_nil(history) <- maybe_history(object) do
+      history
+    else
+      _ -> history_skeleton()
+    end
+  end
+
+  defp history_skeleton do
+    %{
+      "type" => "OrderedCollection",
+      "totalItems" => 0,
+      "orderedItems" => []
+    }
+  end
+
+  def maybe_update_history(
+        updated_object,
+        orig_object_data,
+        opts
+      ) do
+    updated = opts[:updated]
+    use_history_in_new_object? = opts[:use_history_in_new_object?]
+
+    if not updated do
+      %{updated_object: updated_object, used_history_in_new_object?: false}
+    else
+      # Put edit history
+      # Note that we may have got the edit history by first fetching the object
+      {new_history, used_history_in_new_object?} =
+        with true <- use_history_in_new_object?,
+             updated_history when not is_nil(updated_history) <- maybe_history(updated_object) do
+          {updated_history, true}
+        else
+          _ ->
+            history = history_for(orig_object_data)
+
+            latest_history_item =
+              orig_object_data
+              |> Map.drop(["id", "formerRepresentations"])
+
+            updated_history =
+              history
+              |> Map.put("orderedItems", [latest_history_item | history["orderedItems"]])
+              |> Map.put("totalItems", history["totalItems"] + 1)
+
+            {updated_history, false}
+        end
+
+      updated_object =
+        updated_object
+        |> Map.put("formerRepresentations", new_history)
+
+      %{updated_object: updated_object, used_history_in_new_object?: used_history_in_new_object?}
+    end
+  end
+
+  defp maybe_update_poll(to_be_updated, updated_object) do
+    choice_key = fn data ->
+      if Map.has_key?(data, "anyOf"), do: "anyOf", else: "oneOf"
+    end
+
+    with true <- to_be_updated["type"] == "Question",
+         key <- choice_key.(updated_object),
+         true <- key == choice_key.(to_be_updated),
+         orig_choices <- to_be_updated[key] |> Enum.map(&Map.drop(&1, ["replies"])),
+         new_choices <- updated_object[key] |> Enum.map(&Map.drop(&1, ["replies"])),
+         true <- orig_choices == new_choices do
+      # Choices are the same, but counts are different
+      to_be_updated
+      |> Map.put(key, updated_object[key])
+    else
+      # Choices (or vote type) have changed, do not allow this
+      _ -> to_be_updated
+    end
+  end
+
+  # This calculates the data to be sent as the object of an Update.
+  # new_data's formerRepresentations is not considered.
+  # formerRepresentations is added to the returned data.
+  def make_update_object_data(original_data, new_data, date) do
+    %{data: updated_data, updated: updated} =
+      original_data
+      |> update_content_fields(new_data)
+
+    if not updated do
+      updated_data
+    else
+      %{updated_object: updated_data} =
+        updated_data
+        |> maybe_update_history(original_data, updated: updated, use_history_in_new_object?: false)
+
+      updated_data
+      |> Map.put("updated", date)
+    end
+  end
+
+  # This calculates the data of the new Object from an Update.
+  # new_data's formerRepresentations is considered.
+  def make_new_object_data_from_update_object(original_data, new_data) do
+    %{data: updated_data, updated: updated} =
+      original_data
+      |> update_content_fields(new_data)
+
+    %{updated_object: updated_data, used_history_in_new_object?: used_history_in_new_object?} =
+      updated_data
+      |> maybe_update_history(original_data, updated: updated, use_history_in_new_object?: false)
+
+    updated_data =
+      updated_data
+      |> maybe_update_poll(new_data)
+
+    %{
+      updated_data: updated_data,
+      updated: updated,
+      used_history_in_new_object?: used_history_in_new_object?
+    }
+  end
+end
diff --git a/lib/pleroma/web/activity_pub/side_effects.ex b/lib/pleroma/web/activity_pub/side_effects.ex
index 1c216ca38..8bc1cb78d 100644
--- a/lib/pleroma/web/activity_pub/side_effects.ex
+++ b/lib/pleroma/web/activity_pub/side_effects.ex
@@ -417,45 +417,6 @@ defp handle_update_user(
   end
 
   @updatable_object_types ["Note", "Question"]
-  defp update_content_fields(orig_object_data, updated_object) do
-    Pleroma.Constants.status_updatable_fields()
-    |> Enum.reduce(
-      %{data: orig_object_data, updated: false},
-      fn field, %{data: data, updated: updated} ->
-        updated = updated or Map.get(updated_object, field) != Map.get(orig_object_data, field)
-
-        data =
-          if Map.has_key?(updated_object, field) do
-            Map.put(data, field, updated_object[field])
-          else
-            Map.drop(data, [field])
-          end
-
-        %{data: data, updated: updated}
-      end
-    )
-  end
-
-  defp maybe_update_poll(to_be_updated, updated_object) do
-    choice_key = fn data ->
-      if Map.has_key?(data, "anyOf"), do: "anyOf", else: "oneOf"
-    end
-
-    with true <- to_be_updated["type"] == "Question",
-         key <- choice_key.(updated_object),
-         true <- key == choice_key.(to_be_updated),
-         orig_choices <- to_be_updated[key] |> Enum.map(&Map.drop(&1, ["replies"])),
-         new_choices <- updated_object[key] |> Enum.map(&Map.drop(&1, ["replies"])),
-         true <- orig_choices == new_choices do
-      # Choices are the same, but counts are different
-      to_be_updated
-      |> Map.put(key, updated_object[key])
-    else
-      # Choices (or vote type) have changed, do not allow this
-      _ -> to_be_updated
-    end
-  end
-
   defp handle_update_object(
          %{data: %{"type" => "Update", "object" => updated_object}} = object,
          meta
@@ -467,14 +428,11 @@ defp handle_update_object(
     updated_object = meta[:object_data]
 
     if orig_object_data["type"] in @updatable_object_types do
-      %{data: updated_object_data, updated: updated} =
-        orig_object_data
-        |> update_content_fields(updated_object)
-
-      updated_object_data =
-        updated_object_data
-        |> Object.maybe_update_history(orig_object_data, updated)
-        |> maybe_update_poll(updated_object)
+      %{
+        updated_data: updated_object_data,
+        updated: updated,
+        used_history_in_new_object?: used_history_in_new_object?
+      } = Object.Updater.make_new_object_data_from_update_object(orig_object_data, updated_object)
 
       changeset =
         orig_object
@@ -486,6 +444,16 @@ defp handle_update_object(
            {:ok, _} <- Object.set_cache(new_object),
            # The metadata/utils.ex uses the object id for the cache.
            {:ok, _} <- Pleroma.Activity.HTML.invalidate_cache_for(new_object.id) do
+        if used_history_in_new_object? do
+          with create_activity when not is_nil(create_activity) <-
+                 Pleroma.Activity.get_create_by_object_ap_id(orig_object_ap_id),
+               {:ok, _} <- Pleroma.Activity.HTML.invalidate_cache_for(create_activity.id) do
+            nil
+          else
+            _ -> nil
+          end
+        end
+
         if updated do
           object
           |> Activity.normalize()
diff --git a/lib/pleroma/web/common_api.ex b/lib/pleroma/web/common_api.ex
index b2a559455..3bb6ceb3c 100644
--- a/lib/pleroma/web/common_api.ex
+++ b/lib/pleroma/web/common_api.ex
@@ -366,15 +366,7 @@ defp make_update_data(user, orig_object, changes) do
 
     with {:ok, draft} <- ActivityDraft.create(user, params) do
       change =
-        Pleroma.Constants.status_updatable_fields()
-        |> Enum.reduce(orig_object.data, fn key, acc ->
-          if Map.has_key?(draft.object, key) do
-            acc |> Map.put(key, Map.get(draft.object, key))
-          else
-            acc |> Map.drop([key])
-          end
-        end)
-        |> Map.put("updated", Utils.make_date())
+        Object.Updater.make_update_object_data(orig_object.data, draft.object, Utils.make_date())
 
       {:ok, change}
     else
diff --git a/lib/pleroma/web/mastodon_api/views/status_view.ex b/lib/pleroma/web/mastodon_api/views/status_view.ex
index 6c58e9bae..3df1a6159 100644
--- a/lib/pleroma/web/mastodon_api/views/status_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/status_view.ex
@@ -273,7 +273,7 @@ def render("show.json", %{activity: %{data: %{"object" => _object}} = activity}
 
     history_len =
       1 +
-        (Object.history_for(object.data)
+        (Object.Updater.history_for(object.data)
          |> Map.get("orderedItems")
          |> length())
 
@@ -419,7 +419,7 @@ def render("history.json", %{activity: %{data: %{"object" => _object}} = activit
     user = CommonAPI.get_user(activity.data["actor"])
 
     past_history =
-      Object.history_for(object.data)
+      Object.Updater.history_for(object.data)
       |> Map.get("orderedItems")
       |> Enum.map(&Map.put(&1, "id", object.data["id"]))
       |> Enum.map(&%Object{data: &1, id: object.id})
-- 
2.43.0


From 1c4065accc6f377ac146e3ee49cfb4e0445eb510 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sat, 25 Jun 2022 01:03:46 -0400
Subject: [PATCH 30/48] Reuse formerRepresentations from remote if possible

---
 lib/pleroma/object/updater.ex        |  8 +++-
 test/pleroma/object/updater_test.exs | 65 ++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+), 2 deletions(-)
 create mode 100644 test/pleroma/object/updater_test.exs

diff --git a/lib/pleroma/object/updater.ex b/lib/pleroma/object/updater.ex
index 03136c38e..0b21f6c99 100644
--- a/lib/pleroma/object/updater.ex
+++ b/lib/pleroma/object/updater.ex
@@ -67,7 +67,7 @@ def maybe_update_history(
       # Note that we may have got the edit history by first fetching the object
       {new_history, used_history_in_new_object?} =
         with true <- use_history_in_new_object?,
-             updated_history when not is_nil(updated_history) <- maybe_history(updated_object) do
+             updated_history when not is_nil(updated_history) <- maybe_history(opts[:new_data]) do
           {updated_history, true}
         else
           _ ->
@@ -142,7 +142,11 @@ def make_new_object_data_from_update_object(original_data, new_data) do
 
     %{updated_object: updated_data, used_history_in_new_object?: used_history_in_new_object?} =
       updated_data
-      |> maybe_update_history(original_data, updated: updated, use_history_in_new_object?: false)
+      |> maybe_update_history(original_data,
+        updated: updated,
+        use_history_in_new_object?: true,
+        new_data: new_data
+      )
 
     updated_data =
       updated_data
diff --git a/test/pleroma/object/updater_test.exs b/test/pleroma/object/updater_test.exs
new file mode 100644
index 000000000..ef13439b9
--- /dev/null
+++ b/test/pleroma/object/updater_test.exs
@@ -0,0 +1,65 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Object.UpdaterTest do
+  use Pleroma.DataCase
+  use Oban.Testing, repo: Pleroma.Repo
+
+  import Pleroma.Factory
+
+  alias Pleroma.Object.Updater
+
+  describe "make_update_object_data/3" do
+    setup do
+      note = insert(:note)
+      %{original_data: note.data}
+    end
+
+    test "it makes an updated field", %{original_data: original_data} do
+      new_data = Map.put(original_data, "content", "new content")
+
+      date = Pleroma.Web.ActivityPub.Utils.make_date()
+      update_object_data = Updater.make_update_object_data(original_data, new_data, date)
+      assert %{"updated" => ^date} = update_object_data
+    end
+
+    test "it creates formerRepresentations", %{original_data: original_data} do
+      new_data = Map.put(original_data, "content", "new content")
+
+      date = Pleroma.Web.ActivityPub.Utils.make_date()
+      update_object_data = Updater.make_update_object_data(original_data, new_data, date)
+
+      history_item = original_data |> Map.drop(["id", "formerRepresentations"])
+
+      assert %{
+               "formerRepresentations" => %{
+                 "totalItems" => 1,
+                 "orderedItems" => [^history_item]
+               }
+             } = update_object_data
+    end
+  end
+
+  describe "make_new_object_data_from_update_object/2" do
+    test "it reuses formerRepresentations if it exists" do
+      %{data: original_data} = insert(:note)
+
+      new_data =
+        original_data
+        |> Map.put("content", "edited")
+
+      date = Pleroma.Web.ActivityPub.Utils.make_date()
+      update_object_data = Updater.make_update_object_data(original_data, new_data, date)
+
+      %{
+        updated_data: _updated_data,
+        updated: updated,
+        used_history_in_new_object?: used_history_in_new_object?
+      } = Updater.make_new_object_data_from_update_object(original_data, update_object_data)
+
+      assert updated
+      assert used_history_in_new_object?
+    end
+  end
+end
-- 
2.43.0


From 12bb15516a11eea24a3bd2d2ef7ef7f875f15d24 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sat, 25 Jun 2022 01:17:09 -0400
Subject: [PATCH 31/48] Verify that formerRepresentation provided in Update is
 used

---
 test/pleroma/object/updater_test.exs | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/test/pleroma/object/updater_test.exs b/test/pleroma/object/updater_test.exs
index ef13439b9..7e9b44823 100644
--- a/test/pleroma/object/updater_test.exs
+++ b/test/pleroma/object/updater_test.exs
@@ -52,14 +52,25 @@ test "it reuses formerRepresentations if it exists" do
       date = Pleroma.Web.ActivityPub.Utils.make_date()
       update_object_data = Updater.make_update_object_data(original_data, new_data, date)
 
+      history = update_object_data["formerRepresentations"]["orderedItems"]
+
+      update_object_data =
+        update_object_data
+        |> put_in(
+          ["formerRepresentations", "orderedItems"],
+          history ++ [Map.put(original_data, "summary", "additional summary")]
+        )
+        |> put_in(["formerRepresentations", "totalItems"], length(history) + 1)
+
       %{
-        updated_data: _updated_data,
+        updated_data: updated_data,
         updated: updated,
         used_history_in_new_object?: used_history_in_new_object?
       } = Updater.make_new_object_data_from_update_object(original_data, update_object_data)
 
       assert updated
       assert used_history_in_new_object?
+      assert updated_data["formerRepresentations"] == update_object_data["formerRepresentations"]
     end
   end
 end
-- 
2.43.0


From a5ba2a3179f1ca2625844c72174f85cf0b48d515 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sat, 25 Jun 2022 09:23:09 -0400
Subject: [PATCH 32/48] Fix local updates causing emojis to be lost

---
 lib/pleroma/web/activity_pub/side_effects.ex |  9 ++++++++-
 test/pleroma/web/common_api_test.exs         | 15 +++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/lib/pleroma/web/activity_pub/side_effects.ex b/lib/pleroma/web/activity_pub/side_effects.ex
index 8bc1cb78d..72db68ab6 100644
--- a/lib/pleroma/web/activity_pub/side_effects.ex
+++ b/lib/pleroma/web/activity_pub/side_effects.ex
@@ -425,7 +425,14 @@ defp handle_update_object(
     orig_object = Object.get_by_ap_id(orig_object_ap_id)
     orig_object_data = orig_object.data
 
-    updated_object = meta[:object_data]
+    updated_object =
+      if meta[:local] do
+        # If this is a local Update, we don't process it by transmogrifier,
+        # so we use the embedded object as-is.
+        updated_object
+      else
+        meta[:object_data]
+      end
 
     if orig_object_data["type"] in @updatable_object_types do
       %{
diff --git a/test/pleroma/web/common_api_test.exs b/test/pleroma/web/common_api_test.exs
index 9c43f7ea8..05537998a 100644
--- a/test/pleroma/web/common_api_test.exs
+++ b/test/pleroma/web/common_api_test.exs
@@ -1343,5 +1343,20 @@ test "does not change visibility" do
       assert Visibility.get_visibility(updated_object) == "private"
       assert Visibility.get_visibility(updated) == "private"
     end
+
+    test "updates a post with emoji" do
+      [{emoji1, _}, {emoji2, _} | _] = Pleroma.Emoji.get_all()
+
+      user = insert(:user)
+
+      {:ok, activity} =
+        CommonAPI.post(user, %{status: "foo1", spoiler_text: "title 1 :#{emoji1}:"})
+
+      {:ok, updated} = CommonAPI.update(user, activity, %{status: "updated 2 :#{emoji2}:"})
+
+      updated_object = Object.normalize(updated)
+      assert updated_object.data["content"] == "updated 2 :#{emoji2}:"
+      assert %{^emoji2 => _} = updated_object.data["emoji"]
+    end
   end
 end
-- 
2.43.0


From acd1daf9ea3b31d490c2d84272562c0214ba2ad0 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sat, 25 Jun 2022 10:03:19 -0400
Subject: [PATCH 33/48] Do not put meta[:object_data] for local Updates

---
 .../web/activity_pub/object_validator.ex      | 12 ++++++-
 .../update_handling_test.exs                  | 31 +++++++++++++++++++
 2 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/lib/pleroma/web/activity_pub/object_validator.ex b/lib/pleroma/web/activity_pub/object_validator.ex
index 3c52fe311..ee716e9f9 100644
--- a/lib/pleroma/web/activity_pub/object_validator.ex
+++ b/lib/pleroma/web/activity_pub/object_validator.ex
@@ -129,7 +129,8 @@ def validate(
         meta
       )
       when objtype in ~w[Question Answer Audio Video Event Article Note Page] do
-    with {:ok, object_data} <- cast_and_apply(object),
+    with {_, false} <- {:local, Access.get(meta, :local, false)},
+         {:ok, object_data} <- cast_and_apply(object),
          meta = Keyword.put(meta, :object_data, object_data |> stringify_keys),
          {:ok, update_activity} <-
            update_activity
@@ -137,6 +138,15 @@ def validate(
            |> Ecto.Changeset.apply_action(:insert) do
       update_activity = stringify_keys(update_activity)
       {:ok, update_activity, meta}
+    else
+      {:local, _} ->
+        with {:ok, object} <-
+               update_activity
+               |> UpdateValidator.cast_and_validate()
+               |> Ecto.Changeset.apply_action(:insert) do
+          object = stringify_keys(object)
+          {:ok, object, meta}
+        end
     end
   end
 
diff --git a/test/pleroma/web/activity_pub/object_validators/update_handling_test.exs b/test/pleroma/web/activity_pub/object_validators/update_handling_test.exs
index 2415355af..997276bcd 100644
--- a/test/pleroma/web/activity_pub/object_validators/update_handling_test.exs
+++ b/test/pleroma/web/activity_pub/object_validators/update_handling_test.exs
@@ -95,5 +95,36 @@ test "converts object into Pleroma's format" do
       assert %{"emoji" => %{"some_emoji" => "https://somewhere.org/emoji/url/1.png"}} =
                meta[:object_data]
     end
+
+    test "returns no object_data in meta for a local Update" do
+      user = insert(:user)
+      note = insert(:note, user: user)
+
+      updated_note =
+        note.data
+        |> Map.put("content", "edited content")
+
+      {:ok, update, _} = Builder.update(user, updated_note)
+
+      assert {:ok, _update, meta} = ObjectValidator.validate(update, local: true)
+      assert is_nil(meta[:object_data])
+    end
+
+    test "returns object_data in meta for a remote Update" do
+      user = insert(:user)
+      note = insert(:note, user: user)
+
+      updated_note =
+        note.data
+        |> Map.put("content", "edited content")
+
+      {:ok, update, _} = Builder.update(user, updated_note)
+
+      assert {:ok, _update, meta} = ObjectValidator.validate(update, local: false)
+      assert meta[:object_data]
+
+      assert {:ok, _update, meta} = ObjectValidator.validate(update, [])
+      assert meta[:object_data]
+    end
   end
 end
-- 
2.43.0


From 53fdb106350f4bd19b302e6205ff69b82abaeda3 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sat, 25 Jun 2022 11:20:46 -0400
Subject: [PATCH 34/48] Make outbound transmogrifier aware of edit history

---
 lib/pleroma/constants.ex                      | 12 +++
 lib/pleroma/web/activity_pub/side_effects.ex  |  3 +-
 .../web/activity_pub/transmogrifier.ex        | 52 ++++++++-----
 .../web/activity_pub/transmogrifier_test.exs  | 75 ++++++++++---------
 test/pleroma/web/common_api_test.exs          | 21 ++++++
 5 files changed, 109 insertions(+), 54 deletions(-)

diff --git a/lib/pleroma/constants.ex b/lib/pleroma/constants.ex
index e65dd2f77..7343ef8c3 100644
--- a/lib/pleroma/constants.ex
+++ b/lib/pleroma/constants.ex
@@ -42,6 +42,18 @@ defmodule Pleroma.Constants do
     ]
   )
 
+  const(updatable_object_types,
+    do: [
+      "Note",
+      "Question",
+      "Audio",
+      "Video",
+      "Event",
+      "Article",
+      "Page"
+    ]
+  )
+
   const(actor_types,
     do: [
       "Application",
diff --git a/lib/pleroma/web/activity_pub/side_effects.ex b/lib/pleroma/web/activity_pub/side_effects.ex
index 72db68ab6..7995e2a4a 100644
--- a/lib/pleroma/web/activity_pub/side_effects.ex
+++ b/lib/pleroma/web/activity_pub/side_effects.ex
@@ -416,7 +416,6 @@ defp handle_update_user(
     {:ok, object, meta}
   end
 
-  @updatable_object_types ["Note", "Question"]
   defp handle_update_object(
          %{data: %{"type" => "Update", "object" => updated_object}} = object,
          meta
@@ -434,7 +433,7 @@ defp handle_update_object(
         meta[:object_data]
       end
 
-    if orig_object_data["type"] in @updatable_object_types do
+    if orig_object_data["type"] in Pleroma.Constants.updatable_object_types() do
       %{
         updated_data: updated_object_data,
         updated: updated,
diff --git a/lib/pleroma/web/activity_pub/transmogrifier.ex b/lib/pleroma/web/activity_pub/transmogrifier.ex
index b75854f74..fa7d8eb30 100644
--- a/lib/pleroma/web/activity_pub/transmogrifier.ex
+++ b/lib/pleroma/web/activity_pub/transmogrifier.ex
@@ -709,6 +709,24 @@ def prepare_object(object) do
     |> strip_internal_fields
     |> strip_internal_tags
     |> set_type
+    |> maybe_process_history
+  end
+
+  defp maybe_process_history(%{"formerRepresentations" => %{"orderedItems" => history}} = object) do
+    processed_history =
+      Enum.map(
+        history,
+        fn
+          item when is_map(item) -> prepare_object(item)
+          item -> item
+        end
+      )
+
+    put_in(object, ["formerRepresentations", "orderedItems"], processed_history)
+  end
+
+  defp maybe_process_history(object) do
+    object
   end
 
   #  @doc
@@ -733,6 +751,21 @@ def prepare_outgoing(%{"type" => activity_type, "object" => object_id} = data)
     {:ok, data}
   end
 
+  def prepare_outgoing(%{"type" => "Update", "object" => %{"type" => objtype} = object} = data)
+      when objtype in Pleroma.Constants.updatable_object_types() do
+    object =
+      object
+      |> prepare_object
+
+    data =
+      data
+      |> Map.put("object", object)
+      |> Map.merge(Utils.make_json_ld_header())
+      |> Map.delete("bcc")
+
+    {:ok, data}
+  end
+
   def prepare_outgoing(%{"type" => "Announce", "actor" => ap_id, "object" => object_id} = data) do
     object =
       object_id
@@ -921,24 +954,7 @@ def prepare_attachments(object) do
   end
 
   def strip_internal_fields(object) do
-    outer = Map.drop(object, Pleroma.Constants.object_internal_fields())
-
-    case outer do
-      %{"formerRepresentations" => %{"orderedItems" => list}} when is_list(list) ->
-        update_in(
-          outer["formerRepresentations"]["orderedItems"],
-          &Enum.map(
-            &1,
-            fn
-              item when is_map(item) -> Map.drop(item, Pleroma.Constants.object_internal_fields())
-              item -> item
-            end
-          )
-        )
-
-      _ ->
-        outer
-    end
+    Map.drop(object, Pleroma.Constants.object_internal_fields())
   end
 
   defp strip_internal_tags(%{"tag" => tags} = object) do
diff --git a/test/pleroma/web/activity_pub/transmogrifier_test.exs b/test/pleroma/web/activity_pub/transmogrifier_test.exs
index 4993f93fa..743abf2de 100644
--- a/test/pleroma/web/activity_pub/transmogrifier_test.exs
+++ b/test/pleroma/web/activity_pub/transmogrifier_test.exs
@@ -287,6 +287,28 @@ test "custom emoji urls are URI encoded" do
 
       assert url == "http://localhost:4001/emoji/dino%20walking.gif"
     end
+
+    test "Updates of Notes are handled" do
+      user = insert(:user)
+
+      {:ok, activity} = CommonAPI.post(user, %{status: "everybody do the dinosaur :dinosaur:"})
+      {:ok, update} = CommonAPI.update(user, activity, %{status: "mew mew :blank:"})
+
+      {:ok, prepared} = Transmogrifier.prepare_outgoing(update.data)
+
+      assert %{
+               "content" => "mew mew :blank:",
+               "tag" => [%{"name" => ":blank:", "type" => "Emoji"}],
+               "formerRepresentations" => %{
+                 "orderedItems" => [
+                   %{
+                     "content" => "everybody do the dinosaur :dinosaur:",
+                     "tag" => [%{"name" => ":dinosaur:", "type" => "Emoji"}]
+                   }
+                 ]
+               }
+             } = prepared["object"]
+    end
   end
 
   describe "user upgrade" do
@@ -551,57 +573,42 @@ test "puts dimensions into attachment url field" do
     end
   end
 
-  describe "strip_internal_fields/1" do
-    test "it strips internal fields in formerRepresentations" do
+  describe "prepare_object/1" do
+    test "it processes history" do
       original = %{
         "formerRepresentations" => %{
           "orderedItems" => [
-            %{"generator" => %{}}
+            %{
+              "generator" => %{},
+              "emoji" => %{"blobcat" => "http://localhost:4001/emoji/blobcat.png"}
+            }
           ]
         }
       }
 
-      stripped = Transmogrifier.strip_internal_fields(original)
+      processed = Transmogrifier.prepare_object(original)
 
-      refute Map.has_key?(
-               Enum.at(stripped["formerRepresentations"]["orderedItems"], 0),
-               "generator"
-             )
+      history_item = Enum.at(processed["formerRepresentations"]["orderedItems"], 0)
+
+      refute Map.has_key?(history_item, "generator")
+
+      assert [%{"name" => ":blobcat:"}] = history_item["tag"]
     end
 
-    test "it strips internal fields in maybe badly-formed formerRepresentations" do
-      original = %{
-        "formerRepresentations" => %{
-          "orderedItems" => [
-            %{"generator" => %{}},
-            "https://example.com/1"
-          ]
-        }
-      }
-
-      stripped = Transmogrifier.strip_internal_fields(original)
-
-      refute Map.has_key?(
-               Enum.at(stripped["formerRepresentations"]["orderedItems"], 0),
-               "generator"
-             )
-
-      assert Enum.at(stripped["formerRepresentations"]["orderedItems"], 1) ==
-               "https://example.com/1"
-    end
-
-    test "it ignores if formerRepresentations does not look like an OrderedCollection" do
+    test "it works when there is no or bad history" do
       original = %{
         "formerRepresentations" => %{
           "items" => [
-            %{"generator" => %{}}
+            %{
+              "generator" => %{},
+              "emoji" => %{"blobcat" => "http://localhost:4001/emoji/blobcat.png"}
+            }
           ]
         }
       }
 
-      stripped = Transmogrifier.strip_internal_fields(original)
-
-      assert Map.has_key?(Enum.at(stripped["formerRepresentations"]["items"], 0), "generator")
+      processed = Transmogrifier.prepare_object(original)
+      assert processed["formerRepresentations"] == original["formerRepresentations"]
     end
   end
 end
diff --git a/test/pleroma/web/common_api_test.exs b/test/pleroma/web/common_api_test.exs
index 05537998a..5480ea0d9 100644
--- a/test/pleroma/web/common_api_test.exs
+++ b/test/pleroma/web/common_api_test.exs
@@ -1358,5 +1358,26 @@ test "updates a post with emoji" do
       assert updated_object.data["content"] == "updated 2 :#{emoji2}:"
       assert %{^emoji2 => _} = updated_object.data["emoji"]
     end
+
+    test "updates a post with emoji and federate properly" do
+      [{emoji1, _}, {emoji2, _} | _] = Pleroma.Emoji.get_all()
+
+      user = insert(:user)
+
+      {:ok, activity} =
+        CommonAPI.post(user, %{status: "foo1", spoiler_text: "title 1 :#{emoji1}:"})
+
+      clear_config([:instance, :federating], true)
+
+      with_mock Pleroma.Web.Federator,
+        publish: fn p -> nil end do
+        {:ok, updated} = CommonAPI.update(user, activity, %{status: "updated 2 :#{emoji2}:"})
+
+        assert updated.data["object"]["content"] == "updated 2 :#{emoji2}:"
+        assert %{^emoji2 => _} = updated.data["object"]["emoji"]
+
+        assert called(Pleroma.Web.Federator.publish(updated))
+      end
+    end
   end
 end
-- 
2.43.0


From e42a6ff405f0f287e380f96f7c045aa340b33235 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sun, 3 Jul 2022 20:02:52 -0400
Subject: [PATCH 35/48] Pass history items through ObjectValidator for
 updatable object types

---
 .../web/activity_pub/object_validator.ex      | 69 +++++++++++++++++--
 .../article_note_page_validator_test.exs      | 44 ++++++++++++
 2 files changed, 106 insertions(+), 7 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/object_validator.ex b/lib/pleroma/web/activity_pub/object_validator.ex
index ee716e9f9..b904d0c2f 100644
--- a/lib/pleroma/web/activity_pub/object_validator.ex
+++ b/lib/pleroma/web/activity_pub/object_validator.ex
@@ -111,15 +111,20 @@ def validate(%{"type" => type} = object, meta)
       end
 
     with {:ok, object} <-
-           object
-           |> validator.cast_and_validate()
-           |> Ecto.Changeset.apply_action(:insert) do
-      object = stringify_keys(object)
+           do_separate_with_history(object, fn object ->
+             with {:ok, object} <-
+                    object
+                    |> validator.cast_and_validate()
+                    |> Ecto.Changeset.apply_action(:insert) do
+               object = stringify_keys(object)
 
-      # Insert copy of hashtags as strings for the non-hashtag table indexing
-      tag = (object["tag"] || []) ++ Object.hashtags(%Object{data: object})
-      object = Map.put(object, "tag", tag)
+               # Insert copy of hashtags as strings for the non-hashtag table indexing
+               tag = (object["tag"] || []) ++ Object.hashtags(%Object{data: object})
+               object = Map.put(object, "tag", tag)
 
+               {:ok, object}
+             end
+           end) do
       {:ok, object, meta}
     end
   end
@@ -240,4 +245,54 @@ def fetch_actor_and_object(object) do
     Object.normalize(object["object"], fetch: true)
     :ok
   end
+
+  defp for_each_history_item(
+         %{"type" => "OrderedCollection", "orderedItems" => items} = history,
+         object,
+         fun
+       ) do
+    processed_items =
+      Enum.map(items, fn item ->
+        with item <- Map.put(item, "id", object["id"]),
+             {:ok, item} <- fun.(item) do
+          item
+        else
+          _ -> nil
+        end
+      end)
+
+    if Enum.all?(processed_items, &(not is_nil(&1))) do
+      {:ok, Map.put(history, "orderedItems", processed_items)}
+    else
+      {:error, :invalid_history}
+    end
+  end
+
+  defp for_each_history_item(nil, _object, _fun) do
+    {:ok, nil}
+  end
+
+  defp for_each_history_item(_, _object, _fun) do
+    {:error, :invalid_history}
+  end
+
+  # fun is (object -> {:ok, validated_object_with_string_keys})
+  defp do_separate_with_history(object, fun) do
+    with history <- object["formerRepresentations"],
+         object <- Map.drop(object, ["formerRepresentations"]),
+         {_, {:ok, object}} <- {:main_body, fun.(object)},
+         {_, {:ok, history}} <- {:history_items, for_each_history_item(history, object, fun)} do
+      object =
+        if history do
+          Map.put(object, "formerRepresentations", history)
+        else
+          object
+        end
+
+      {:ok, object}
+    else
+      {:main_body, e} -> e
+      {:history_items, e} -> e
+    end
+  end
 end
diff --git a/test/pleroma/web/activity_pub/object_validators/article_note_page_validator_test.exs b/test/pleroma/web/activity_pub/object_validators/article_note_page_validator_test.exs
index 2aed65e4a..eaa9e8cdd 100644
--- a/test/pleroma/web/activity_pub/object_validators/article_note_page_validator_test.exs
+++ b/test/pleroma/web/activity_pub/object_validators/article_note_page_validator_test.exs
@@ -5,6 +5,7 @@
 defmodule Pleroma.Web.ActivityPub.ObjectValidators.ArticleNotePageValidatorTest do
   use Pleroma.DataCase, async: true
 
+  alias Pleroma.Web.ActivityPub.ObjectValidator
   alias Pleroma.Web.ActivityPub.ObjectValidators.ArticleNotePageValidator
   alias Pleroma.Web.ActivityPub.Utils
 
@@ -149,4 +150,47 @@ test "a misskey MFM status with a _misskey_content field should work and be link
       } = ArticleNotePageValidator.cast_and_validate(note)
     end
   end
+
+  describe "Note with history" do
+    setup do
+      user = insert(:user)
+      {:ok, activity} = Pleroma.Web.CommonAPI.post(user, %{status: "mew mew :dinosaur:"})
+      {:ok, edit} = Pleroma.Web.CommonAPI.update(user, activity, %{status: "edited :blank:"})
+
+      {:ok, %{"object" => external_rep}} =
+        Pleroma.Web.ActivityPub.Transmogrifier.prepare_outgoing(edit.data)
+
+      %{external_rep: external_rep}
+    end
+
+    test "edited note", %{external_rep: external_rep} do
+      assert %{"formerRepresentations" => %{"orderedItems" => [%{"tag" => [_]}]}} = external_rep
+
+      {:ok, validate_res, []} = ObjectValidator.validate(external_rep, [])
+
+      assert %{"formerRepresentations" => %{"orderedItems" => [%{"emoji" => %{"dinosaur" => _}}]}} =
+               validate_res
+    end
+
+    test "edited note, badly-formed formerRepresentations", %{external_rep: external_rep} do
+      external_rep = Map.put(external_rep, "formerRepresentations", %{})
+
+      assert {:error, _} = ObjectValidator.validate(external_rep, [])
+    end
+
+    test "edited note, badly-formed history item", %{external_rep: external_rep} do
+      history_item =
+        Enum.at(external_rep["formerRepresentations"]["orderedItems"], 0)
+        |> Map.put("type", "Foo")
+
+      external_rep =
+        put_in(
+          external_rep,
+          ["formerRepresentations", "orderedItems"],
+          [history_item]
+        )
+
+      assert {:error, _} = ObjectValidator.validate(external_rep, [])
+    end
+  end
 end
-- 
2.43.0


From f6384bfdd59ce06492e7da37ad17a2ffdfe4ced7 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sun, 3 Jul 2022 20:19:50 -0400
Subject: [PATCH 36/48] Validate object data for incoming Update activities

In Create validator we do not validate the object data,
but that is because the object itself will go through the
pipeline again, which is not the case for Update. Thus,
we added validation for objects in Update activities.
---
 .../web/activity_pub/object_validator.ex      |  7 +++-
 .../update_handling_test.exs                  | 38 +++++++++++++++++++
 2 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/object_validator.ex b/lib/pleroma/web/activity_pub/object_validator.ex
index b904d0c2f..1d4bcc863 100644
--- a/lib/pleroma/web/activity_pub/object_validator.ex
+++ b/lib/pleroma/web/activity_pub/object_validator.ex
@@ -135,8 +135,8 @@ def validate(
       )
       when objtype in ~w[Question Answer Audio Video Event Article Note Page] do
     with {_, false} <- {:local, Access.get(meta, :local, false)},
-         {:ok, object_data} <- cast_and_apply(object),
-         meta = Keyword.put(meta, :object_data, object_data |> stringify_keys),
+         {_, {:ok, object_data, _}} <- {:object_validation, validate(object, meta)},
+         meta = Keyword.put(meta, :object_data, object_data),
          {:ok, update_activity} <-
            update_activity
            |> UpdateValidator.cast_and_validate()
@@ -152,6 +152,9 @@ def validate(
           object = stringify_keys(object)
           {:ok, object, meta}
         end
+
+      {:object_validation, e} ->
+        e
     end
   end
 
diff --git a/test/pleroma/web/activity_pub/object_validators/update_handling_test.exs b/test/pleroma/web/activity_pub/object_validators/update_handling_test.exs
index 997276bcd..a74ee2416 100644
--- a/test/pleroma/web/activity_pub/object_validators/update_handling_test.exs
+++ b/test/pleroma/web/activity_pub/object_validators/update_handling_test.exs
@@ -127,4 +127,42 @@ test "returns object_data in meta for a remote Update" do
       assert meta[:object_data]
     end
   end
+
+  describe "update with history" do
+    setup do
+      user = insert(:user)
+      {:ok, activity} = Pleroma.Web.CommonAPI.post(user, %{status: "mew mew :dinosaur:"})
+      {:ok, edit} = Pleroma.Web.CommonAPI.update(user, activity, %{status: "edited :blank:"})
+      {:ok, external_rep} = Pleroma.Web.ActivityPub.Transmogrifier.prepare_outgoing(edit.data)
+      %{external_rep: external_rep}
+    end
+
+    test "edited note", %{external_rep: external_rep} do
+      {:ok, _validate_res, meta} = ObjectValidator.validate(external_rep, [])
+
+      assert %{"formerRepresentations" => %{"orderedItems" => [%{"emoji" => %{"dinosaur" => _}}]}} =
+               meta[:object_data]
+    end
+
+    test "edited note, badly-formed formerRepresentations", %{external_rep: external_rep} do
+      external_rep = put_in(external_rep, ["object", "formerRepresentations"], %{})
+
+      assert {:error, _} = ObjectValidator.validate(external_rep, [])
+    end
+
+    test "edited note, badly-formed history item", %{external_rep: external_rep} do
+      history_item =
+        Enum.at(external_rep["object"]["formerRepresentations"]["orderedItems"], 0)
+        |> Map.put("type", "Foo")
+
+      external_rep =
+        put_in(
+          external_rep,
+          ["object", "formerRepresentations", "orderedItems"],
+          [history_item]
+        )
+
+      assert {:error, _} = ObjectValidator.validate(external_rep, [])
+    end
+  end
 end
-- 
2.43.0


From c93ab3b80f8f481f9a489bf5d9143978825f8feb Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Wed, 6 Jul 2022 01:19:53 -0400
Subject: [PATCH 37/48] Fix cannot get full history on object fetch

---
 .../web/activity_pub/object_validator.ex      | 13 ++-
 test/pleroma/object/fetcher_test.exs          | 80 +++++++++++++++++++
 2 files changed, 91 insertions(+), 2 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/object_validator.ex b/lib/pleroma/web/activity_pub/object_validator.ex
index 1d4bcc863..cb0cc9ed7 100644
--- a/lib/pleroma/web/activity_pub/object_validator.ex
+++ b/lib/pleroma/web/activity_pub/object_validator.ex
@@ -86,8 +86,8 @@ def validate(
         meta
       )
       when objtype in ~w[Question Answer Audio Video Event Article Note Page] do
-    with {:ok, object_data} <- cast_and_apply(object),
-         meta = Keyword.put(meta, :object_data, object_data |> stringify_keys),
+    with {:ok, object_data} <- cast_and_apply_and_stringify_with_history(object),
+         meta = Keyword.put(meta, :object_data, object_data),
          {:ok, create_activity} <-
            create_activity
            |> CreateGenericValidator.cast_and_validate(meta)
@@ -194,6 +194,15 @@ def validate(%{"type" => type} = object, meta) when type in ~w(Add Remove) do
 
   def validate(o, m), do: {:error, {:validator_not_set, {o, m}}}
 
+  def cast_and_apply_and_stringify_with_history(object) do
+    do_separate_with_history(object, fn object ->
+      with {:ok, object_data} <- cast_and_apply(object),
+           object_data <- object_data |> stringify_keys() do
+        {:ok, object_data}
+      end
+    end)
+  end
+
   def cast_and_apply(%{"type" => "Question"} = object) do
     QuestionValidator.cast_and_apply(object)
   end
diff --git a/test/pleroma/object/fetcher_test.exs b/test/pleroma/object/fetcher_test.exs
index 585be0376..c321032ad 100644
--- a/test/pleroma/object/fetcher_test.exs
+++ b/test/pleroma/object/fetcher_test.exs
@@ -456,4 +456,84 @@ test "it adds to formerRepresentations if the remote does not have one and the o
              } = refetched.data
     end
   end
+
+  describe "fetch with history" do
+    setup do
+      object2 = %{
+        "id" => "https://mastodon.social/2",
+        "actor" => "https://mastodon.social/users/emelie",
+        "attributedTo" => "https://mastodon.social/users/emelie",
+        "type" => "Note",
+        "content" => "test 2",
+        "bcc" => [],
+        "bto" => [],
+        "cc" => ["https://mastodon.social/users/emelie/followers"],
+        "to" => [],
+        "summary" => "",
+        "formerRepresentations" => %{
+          "type" => "OrderedCollection",
+          "orderedItems" => [
+            %{
+              "type" => "Note",
+              "content" => "orig 2",
+              "actor" => "https://mastodon.social/users/emelie",
+              "attributedTo" => "https://mastodon.social/users/emelie",
+              "bcc" => [],
+              "bto" => [],
+              "cc" => ["https://mastodon.social/users/emelie/followers"],
+              "to" => [],
+              "summary" => ""
+            }
+          ],
+          "totalItems" => 1
+        }
+      }
+
+      mock(fn
+        %{
+          method: :get,
+          url: "https://mastodon.social/2"
+        } ->
+          %Tesla.Env{
+            status: 200,
+            headers: [{"content-type", "application/activity+json"}],
+            body: Jason.encode!(object2)
+          }
+
+        %{
+          method: :get,
+          url: "https://mastodon.social/users/emelie/collections/featured"
+        } ->
+          %Tesla.Env{
+            status: 200,
+            headers: [{"content-type", "application/activity+json"}],
+            body:
+              Jason.encode!(%{
+                "id" => "https://mastodon.social/users/emelie/collections/featured",
+                "type" => "OrderedCollection",
+                "actor" => "https://mastodon.social/users/emelie",
+                "attributedTo" => "https://mastodon.social/users/emelie",
+                "orderedItems" => [],
+                "totalItems" => 0
+              })
+          }
+
+        env ->
+          apply(HttpRequestMock, :request, [env])
+      end)
+
+      %{object2: object2}
+    end
+
+    test "it gets history", %{object2: object2} do
+      {:ok, object} = Fetcher.fetch_object_from_id(object2["id"])
+
+      assert %{
+               "formerRepresentations" => %{
+                 "type" => "OrderedCollection",
+                 "orderedItems" => [%{}]
+               }
+             } = object.data
+    end
+  end
 end
-- 
2.43.0


From ce13b9c1835b22f1b7626bc9987c6bb426134695 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Thu, 7 Jul 2022 15:11:29 -0400
Subject: [PATCH 38/48] Guard against outdated Updates

It is possible for an earlier Update to be received by us later.
For this, we now
(1) only allows Updates to poll counts if there is no updated field,
    or the updated field is the same as the last updated date or
    creation date;
(2) does not allow updating anything if the updated field
    is older than the last updated date or creation date;
(3) allows updating updatable fields otherwise (normal updates);
(4) if only the updated field is changed, it does not create
    a new history item on its own.
---
 lib/pleroma/object/updater.ex                 | 65 ++++++++++---
 .../web/activity_pub/side_effects_test.exs    | 96 ++++++++++++++++++-
 test/pleroma/web/common_api_test.exs          |  2 +-
 3 files changed, 145 insertions(+), 18 deletions(-)

diff --git a/lib/pleroma/object/updater.ex b/lib/pleroma/object/updater.ex
index 0b21f6c99..3d34c3f27 100644
--- a/lib/pleroma/object/updater.ex
+++ b/lib/pleroma/object/updater.ex
@@ -10,7 +10,10 @@ def update_content_fields(orig_object_data, updated_object) do
     |> Enum.reduce(
       %{data: orig_object_data, updated: false},
       fn field, %{data: data, updated: updated} ->
-        updated = updated or Map.get(updated_object, field) != Map.get(orig_object_data, field)
+        updated =
+          updated or
+            (field != "updated" and
+               Map.get(updated_object, field) != Map.get(orig_object_data, field))
 
         data =
           if Map.has_key?(updated_object, field) do
@@ -136,21 +139,57 @@ def make_update_object_data(original_data, new_data, date) do
   # This calculates the data of the new Object from an Update.
   # new_data's formerRepresentations is considered.
   def make_new_object_data_from_update_object(original_data, new_data) do
-    %{data: updated_data, updated: updated} =
-      original_data
-      |> update_content_fields(new_data)
+    update_is_reasonable =
+      with {_, updated} when not is_nil(updated) <- {:cur_updated, new_data["updated"]},
+           {_, {:ok, updated_time, _}} <- {:cur_updated, DateTime.from_iso8601(updated)},
+           {_, last_updated} when not is_nil(last_updated) <-
+             {:last_updated, original_data["updated"] || original_data["published"]},
+           {_, {:ok, last_updated_time, _}} <-
+             {:last_updated, DateTime.from_iso8601(last_updated)},
+           :gt <- DateTime.compare(updated_time, last_updated_time) do
+        :update_everything
+      else
+        # only allow poll updates
+        {:cur_updated, _} -> :no_content_update
+        :eq -> :no_content_update
+        # allow all updates
+        {:last_updated, _} -> :update_everything
+        # allow no updates
+        _ -> false
+      end
 
-    %{updated_object: updated_data, used_history_in_new_object?: used_history_in_new_object?} =
-      updated_data
-      |> maybe_update_history(original_data,
-        updated: updated,
-        use_history_in_new_object?: true,
-        new_data: new_data
-      )
+    %{
+      updated_object: updated_data,
+      used_history_in_new_object?: used_history_in_new_object?,
+      updated: updated
+    } =
+      if update_is_reasonable == :update_everything do
+        %{data: updated_data, updated: updated} =
+          original_data
+          |> update_content_fields(new_data)
+
+        updated_data
+        |> maybe_update_history(original_data,
+          updated: updated,
+          use_history_in_new_object?: true,
+          new_data: new_data
+        )
+        |> Map.put(:updated, updated)
+      else
+        %{
+          updated_object: original_data,
+          used_history_in_new_object?: false,
+          updated: false
+        }
+      end
 
     updated_data =
-      updated_data
-      |> maybe_update_poll(new_data)
+      if update_is_reasonable != false do
+        updated_data
+        |> maybe_update_poll(new_data)
+      else
+        updated_data
+      end
 
     %{
       updated_data: updated_data,
diff --git a/test/pleroma/web/activity_pub/side_effects_test.exs b/test/pleroma/web/activity_pub/side_effects_test.exs
index d98fb38cf..7cea1f993 100644
--- a/test/pleroma/web/activity_pub/side_effects_test.exs
+++ b/test/pleroma/web/activity_pub/side_effects_test.exs
@@ -147,14 +147,19 @@ test "it uses a given changeset to update", %{user: user, update: update} do
 
   describe "update notes" do
     setup do
+      make_time = fn ->
+        Pleroma.Web.ActivityPub.Utils.make_date()
+      end
+
       user = insert(:user)
-      note = insert(:note, user: user)
+      note = insert(:note, user: user, data: %{"published" => make_time.()})
       _note_activity = insert(:note_activity, note: note)
 
       updated_note =
         note.data
         |> Map.put("summary", "edited summary")
         |> Map.put("content", "edited content")
+        |> Map.put("updated", make_time.())
 
       {:ok, update_data, []} = Builder.update(user, updated_note)
       {:ok, update, _meta} = ActivityPub.persist(update_data, local: true)
@@ -175,8 +180,69 @@ test "it updates the note", %{
       updated_note: updated_note
     } do
       {:ok, _, _} = SideEffects.handle(update, object_data: updated_note)
+      updated_time = updated_note["updated"]
+
       new_note = Pleroma.Object.get_by_id(object_id)
-      assert %{"summary" => "edited summary", "content" => "edited content"} = new_note.data
+
+      assert %{
+               "summary" => "edited summary",
+               "content" => "edited content",
+               "updated" => ^updated_time
+             } = new_note.data
+    end
+
+    test "it rejects updates with no updated attribute in object", %{
+      object_id: object_id,
+      update: update,
+      updated_note: updated_note
+    } do
+      old_note = Pleroma.Object.get_by_id(object_id)
+      updated_note = Map.drop(updated_note, ["updated"])
+      {:ok, _, _} = SideEffects.handle(update, object_data: updated_note)
+      new_note = Pleroma.Object.get_by_id(object_id)
+      assert old_note.data == new_note.data
+    end
+
+    test "it rejects updates with updated attribute older than what we have in the original object",
+         %{
+           object_id: object_id,
+           update: update,
+           updated_note: updated_note
+         } do
+      old_note = Pleroma.Object.get_by_id(object_id)
+      {:ok, creation_time, _} = DateTime.from_iso8601(old_note.data["published"])
+
+      updated_note =
+        Map.put(updated_note, "updated", DateTime.to_iso8601(DateTime.add(creation_time, -10)))
+
+      {:ok, _, _} = SideEffects.handle(update, object_data: updated_note)
+      new_note = Pleroma.Object.get_by_id(object_id)
+      assert old_note.data == new_note.data
+    end
+
+    test "it rejects updates with updated attribute older than the last Update", %{
+      object_id: object_id,
+      update: update,
+      updated_note: updated_note
+    } do
+      old_note = Pleroma.Object.get_by_id(object_id)
+      {:ok, creation_time, _} = DateTime.from_iso8601(old_note.data["published"])
+
+      updated_note =
+        Map.put(updated_note, "updated", DateTime.to_iso8601(DateTime.add(creation_time, +10)))
+
+      {:ok, _, _} = SideEffects.handle(update, object_data: updated_note)
+
+      old_note = Pleroma.Object.get_by_id(object_id)
+      {:ok, update_time, _} = DateTime.from_iso8601(old_note.data["updated"])
+
+      updated_note =
+        Map.put(updated_note, "updated", DateTime.to_iso8601(DateTime.add(update_time, -5)))
+
+      {:ok, _, _} = SideEffects.handle(update, object_data: updated_note)
+
+      new_note = Pleroma.Object.get_by_id(object_id)
+      assert old_note.data == new_note.data
     end
 
     test "it updates using object_data", %{
@@ -220,6 +286,14 @@ test "it puts the original note at the front of formerRepresentations", %{
         note.data
         |> Map.put("summary", "edited summary 2")
         |> Map.put("content", "edited content 2")
+        |> Map.put(
+          "updated",
+          first_edit["updated"]
+          |> DateTime.from_iso8601()
+          |> elem(1)
+          |> DateTime.add(10)
+          |> DateTime.to_iso8601()
+        )
 
       {:ok, second_update_data, []} = Builder.update(user, second_updated_note)
       {:ok, update, _meta} = ActivityPub.persist(second_update_data, local: true)
@@ -243,7 +317,18 @@ test "it does not prepend to formerRepresentations if no actual changes are made
       updated_note: updated_note
     } do
       {:ok, _, _} = SideEffects.handle(update, object_data: updated_note)
-      %{data: _first_edit} = Pleroma.Object.get_by_id(object_id)
+      %{data: first_edit} = Pleroma.Object.get_by_id(object_id)
+
+      updated_note =
+        updated_note
+        |> Map.put(
+          "updated",
+          first_edit["updated"]
+          |> DateTime.from_iso8601()
+          |> elem(1)
+          |> DateTime.add(10)
+          |> DateTime.to_iso8601()
+        )
 
       {:ok, _, _} = SideEffects.handle(update, object_data: updated_note)
       %{data: new_note} = Pleroma.Object.get_by_id(object_id)
@@ -275,7 +360,10 @@ test "allows updating choice count without generating edit history", %{
         data["oneOf"]
         |> Enum.map(fn choice -> put_in(choice, ["replies", "totalItems"], 5) end)
 
-      updated_question = data |> Map.put("oneOf", new_choices)
+      updated_question =
+        data
+        |> Map.put("oneOf", new_choices)
+        |> Map.put("updated", Pleroma.Web.ActivityPub.Utils.make_date())
 
       {:ok, update_data, []} = Builder.update(user, updated_question)
       {:ok, update, _meta} = ActivityPub.persist(update_data, local: true)
diff --git a/test/pleroma/web/common_api_test.exs b/test/pleroma/web/common_api_test.exs
index 5480ea0d9..fe59d6b1e 100644
--- a/test/pleroma/web/common_api_test.exs
+++ b/test/pleroma/web/common_api_test.exs
@@ -1370,7 +1370,7 @@ test "updates a post with emoji and federate properly" do
       clear_config([:instance, :federating], true)
 
       with_mock Pleroma.Web.Federator,
-        publish: fn p -> nil end do
+        publish: fn _p -> nil end do
         {:ok, updated} = CommonAPI.update(user, activity, %{status: "updated 2 :#{emoji2}:"})
 
         assert updated.data["object"]["content"] == "updated 2 :#{emoji2}:"
-- 
2.43.0


From 13e6deccfcf651e4ca86148718b17184dc9f4895 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Thu, 7 Jul 2022 15:22:04 -0400
Subject: [PATCH 39/48] Test that Question updates are viable

---
 .../web/activity_pub/side_effects_test.exs    | 60 ++++++++++++++++++-
 1 file changed, 59 insertions(+), 1 deletion(-)

diff --git a/test/pleroma/web/activity_pub/side_effects_test.exs b/test/pleroma/web/activity_pub/side_effects_test.exs
index 7cea1f993..b2f0805d6 100644
--- a/test/pleroma/web/activity_pub/side_effects_test.exs
+++ b/test/pleroma/web/activity_pub/side_effects_test.exs
@@ -346,7 +346,12 @@ test "it does not prepend to formerRepresentations if no actual changes are made
   describe "update questions" do
     setup do
       user = insert(:user)
-      question = insert(:question, user: user)
+
+      question =
+        insert(:question,
+          user: user,
+          data: %{"published" => Pleroma.Web.ActivityPub.Utils.make_date()}
+        )
 
       %{user: user, data: question.data, id: question.id}
     end
@@ -377,6 +382,59 @@ test "allows updating choice count without generating edit history", %{
 
       refute Map.has_key?(new_question, "formerRepresentations")
     end
+
+    test "allows updating choice count without updated field", %{
+      user: user,
+      data: data,
+      id: id
+    } do
+      new_choices =
+        data["oneOf"]
+        |> Enum.map(fn choice -> put_in(choice, ["replies", "totalItems"], 5) end)
+
+      updated_question =
+        data
+        |> Map.put("oneOf", new_choices)
+
+      {:ok, update_data, []} = Builder.update(user, updated_question)
+      {:ok, update, _meta} = ActivityPub.persist(update_data, local: true)
+
+      {:ok, _, _} = SideEffects.handle(update, object_data: updated_question)
+
+      %{data: new_question} = Pleroma.Object.get_by_id(id)
+
+      assert [%{"replies" => %{"totalItems" => 5}}, %{"replies" => %{"totalItems" => 5}}] =
+               new_question["oneOf"]
+
+      refute Map.has_key?(new_question, "formerRepresentations")
+    end
+
+    test "allows updating choice count with updated field same as the creation date", %{
+      user: user,
+      data: data,
+      id: id
+    } do
+      new_choices =
+        data["oneOf"]
+        |> Enum.map(fn choice -> put_in(choice, ["replies", "totalItems"], 5) end)
+
+      updated_question =
+        data
+        |> Map.put("oneOf", new_choices)
+        |> Map.put("updated", data["published"])
+
+      {:ok, update_data, []} = Builder.update(user, updated_question)
+      {:ok, update, _meta} = ActivityPub.persist(update_data, local: true)
+
+      {:ok, _, _} = SideEffects.handle(update, object_data: updated_question)
+
+      %{data: new_question} = Pleroma.Object.get_by_id(id)
+
+      assert [%{"replies" => %{"totalItems" => 5}}, %{"replies" => %{"totalItems" => 5}}] =
+               new_question["oneOf"]
+
+      refute Map.has_key?(new_question, "formerRepresentations")
+    end
   end
 
   describe "EmojiReact objects" do
-- 
2.43.0


From 5a1c5eebd5a81dc67ffb0a6e3357415ac0900227 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sat, 9 Jul 2022 18:00:42 -0400
Subject: [PATCH 40/48] Fix remote emoji in subject disappearing after edits

---
 lib/pleroma/web/common_api.ex        |  9 +++++-
 test/pleroma/web/common_api_test.exs | 42 ++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/lib/pleroma/web/common_api.ex b/lib/pleroma/web/common_api.ex
index 3bb6ceb3c..486bd81a7 100644
--- a/lib/pleroma/web/common_api.ex
+++ b/lib/pleroma/web/common_api.ex
@@ -359,7 +359,14 @@ def update(user, orig_activity, changes) do
 
   defp make_update_data(user, orig_object, changes) do
     kept_params = %{
-      visibility: Visibility.get_visibility(orig_object)
+      visibility: Visibility.get_visibility(orig_object),
+      in_reply_to_id:
+        with replied_id when is_binary(replied_id) <- orig_object.data["inReplyTo"],
+             %Activity{id: activity_id} <- Activity.get_create_by_object_ap_id(replied_id) do
+          activity_id
+        else
+          _ -> nil
+        end
     }
 
     params = Map.merge(changes, kept_params)
diff --git a/test/pleroma/web/common_api_test.exs b/test/pleroma/web/common_api_test.exs
index fe59d6b1e..e9598aea0 100644
--- a/test/pleroma/web/common_api_test.exs
+++ b/test/pleroma/web/common_api_test.exs
@@ -1379,5 +1379,47 @@ test "updates a post with emoji and federate properly" do
         assert called(Pleroma.Web.Federator.publish(updated))
       end
     end
+
+    test "editing a post that copied a remote title with remote emoji should keep that emoji" do
+      remote_emoji_uri = "https://remote.org/emoji.png"
+
+      note =
+        insert(
+          :note,
+          data: %{
+            "summary" => ":remoteemoji:",
+            "emoji" => %{
+              "remoteemoji" => remote_emoji_uri
+            },
+            "tag" => [
+              %{
+                "type" => "Emoji",
+                "name" => "remoteemoji",
+                "icon" => %{"url" => remote_emoji_uri}
+              }
+            ]
+          }
+        )
+
+      note_activity = insert(:note_activity, note: note)
+
+      user = insert(:user)
+
+      {:ok, reply} =
+        CommonAPI.post(user, %{
+          status: "reply",
+          spoiler_text: ":remoteemoji:",
+          in_reply_to_id: note_activity.id
+        })
+
+      assert reply.object.data["emoji"]["remoteemoji"] == remote_emoji_uri
+
+      {:ok, edit} =
+        CommonAPI.update(user, reply, %{status: "reply mew mew", spoiler_text: ":remoteemoji:"})
+
+      edited_note = Pleroma.Object.normalize(edit)
+
+      assert edited_note.data["emoji"]["remoteemoji"] == remote_emoji_uri
+    end
   end
 end
-- 
2.43.0


From 2ad579d4679176c24b2376631f46ef789f37a762 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sat, 23 Jul 2022 15:56:36 -0400
Subject: [PATCH 41/48] Make MRF Keyword history-aware

---
 lib/pleroma/object/updater.ex                 |  40 ++++++
 .../web/activity_pub/mrf/keyword_policy.ex    |  55 ++++++--
 .../activity_pub/mrf/keyword_policy_test.exs  | 131 ++++++++++++++++++
 test/pleroma/web/common_api_test.exs          |  17 +++
 4 files changed, 231 insertions(+), 12 deletions(-)

diff --git a/lib/pleroma/object/updater.ex b/lib/pleroma/object/updater.ex
index 3d34c3f27..6381320bd 100644
--- a/lib/pleroma/object/updater.ex
+++ b/lib/pleroma/object/updater.ex
@@ -197,4 +197,44 @@ def make_new_object_data_from_update_object(original_data, new_data) do
       used_history_in_new_object?: used_history_in_new_object?
     }
   end
+
+  defp for_each_history_item(%{"orderedItems" => items} = history, _object, fun) do
+    new_items =
+      Enum.map(items, fun)
+      |> Enum.reduce_while(
+        {:ok, []},
+        fn
+          {:ok, item}, {:ok, acc} -> {:cont, {:ok, acc ++ [item]}}
+          e, _acc -> {:halt, e}
+        end
+      )
+
+    case new_items do
+      {:ok, items} -> {:ok, Map.put(history, "orderedItems", items)}
+      e -> e
+    end
+  end
+
+  defp for_each_history_item(history, _, _) do
+    {:ok, history}
+  end
+
+  def do_with_history(object, fun) do
+    with history <- object["formerRepresentations"],
+         object <- Map.drop(object, ["formerRepresentations"]),
+         {_, {:ok, object}} <- {:main_body, fun.(object)},
+         {_, {:ok, history}} <- {:history_items, for_each_history_item(history, object, fun)} do
+      object =
+        if history do
+          Map.put(object, "formerRepresentations", history)
+        else
+          object
+        end
+
+      {:ok, object}
+    else
+      {:main_body, e} -> e
+      {:history_items, e} -> e
+    end
+  end
 end
diff --git a/lib/pleroma/web/activity_pub/mrf/keyword_policy.ex b/lib/pleroma/web/activity_pub/mrf/keyword_policy.ex
index 1383fa757..7c921fc76 100644
--- a/lib/pleroma/web/activity_pub/mrf/keyword_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/keyword_policy.ex
@@ -27,24 +27,46 @@ defp object_payload(%{} = object) do
   end
 
   defp check_reject(%{"object" => %{} = object} = message) do
-    payload = object_payload(object)
+    with {:ok, _new_object} <-
+           Pleroma.Object.Updater.do_with_history(object, fn object ->
+             payload = object_payload(object)
 
-    if Enum.any?(Pleroma.Config.get([:mrf_keyword, :reject]), fn pattern ->
-         string_matches?(payload, pattern)
-       end) do
-      {:reject, "[KeywordPolicy] Matches with rejected keyword"}
-    else
+             if Enum.any?(Pleroma.Config.get([:mrf_keyword, :reject]), fn pattern ->
+                  string_matches?(payload, pattern)
+                end) do
+               {:reject, "[KeywordPolicy] Matches with rejected keyword"}
+             else
+               {:ok, message}
+             end
+           end) do
       {:ok, message}
+    else
+      e -> e
     end
   end
 
-  defp check_ftl_removal(%{"to" => to, "object" => %{} = object} = message) do
-    payload = object_payload(object)
+  defp check_ftl_removal(%{"type" => "Create", "to" => to, "object" => %{} = object} = message) do
+    check_keyword = fn object ->
+      payload = object_payload(object)
 
-    if Pleroma.Constants.as_public() in to and
-         Enum.any?(Pleroma.Config.get([:mrf_keyword, :federated_timeline_removal]), fn pattern ->
+      if Enum.any?(Pleroma.Config.get([:mrf_keyword, :federated_timeline_removal]), fn pattern ->
            string_matches?(payload, pattern)
          end) do
+        {:should_delist, nil}
+      else
+        {:ok, %{}}
+      end
+    end
+
+    should_delist? = fn object ->
+      with {:ok, _} <- Pleroma.Object.Updater.do_with_history(object, check_keyword) do
+        false
+      else
+        _ -> true
+      end
+    end
+
+    if Pleroma.Constants.as_public() in to and should_delist?.(object) do
       to = List.delete(to, Pleroma.Constants.as_public())
       cc = [Pleroma.Constants.as_public() | message["cc"] || []]
 
@@ -59,8 +81,12 @@ defp check_ftl_removal(%{"to" => to, "object" => %{} = object} = message) do
     end
   end
 
+  defp check_ftl_removal(message) do
+    {:ok, message}
+  end
+
   defp check_replace(%{"object" => %{} = object} = message) do
-    object =
+    replace_kw = fn object ->
       ["content", "name", "summary"]
       |> Enum.filter(fn field -> Map.has_key?(object, field) && object[field] end)
       |> Enum.reduce(object, fn field, object ->
@@ -73,6 +99,10 @@ defp check_replace(%{"object" => %{} = object} = message) do
 
         Map.put(object, field, data)
       end)
+      |> (fn object -> {:ok, object} end).()
+    end
+
+    {:ok, object} = Pleroma.Object.Updater.do_with_history(object, replace_kw)
 
     message = Map.put(message, "object", object)
 
@@ -80,7 +110,8 @@ defp check_replace(%{"object" => %{} = object} = message) do
   end
 
   @impl true
-  def filter(%{"type" => "Create", "object" => %{"content" => _content}} = message) do
+  def filter(%{"type" => type, "object" => %{"content" => _content}} = message)
+      when type in ["Create", "Update"] do
     with {:ok, message} <- check_reject(message),
          {:ok, message} <- check_ftl_removal(message),
          {:ok, message} <- check_replace(message) do
diff --git a/test/pleroma/web/activity_pub/mrf/keyword_policy_test.exs b/test/pleroma/web/activity_pub/mrf/keyword_policy_test.exs
index 8af4c5efa..9bc8c8355 100644
--- a/test/pleroma/web/activity_pub/mrf/keyword_policy_test.exs
+++ b/test/pleroma/web/activity_pub/mrf/keyword_policy_test.exs
@@ -79,6 +79,54 @@ test "rejects if regex matches in summary" do
                    KeywordPolicy.filter(message)
                end)
     end
+
+    test "rejects if string matches in history" do
+      clear_config([:mrf_keyword, :reject], ["pun"])
+
+      message = %{
+        "type" => "Create",
+        "object" => %{
+          "content" => "just a daily reminder that compLAINer is a good",
+          "summary" => "",
+          "formerRepresentations" => %{
+            "type" => "OrderedCollection",
+            "orderedItems" => [
+              %{
+                "content" => "just a daily reminder that compLAINer is a good pun",
+                "summary" => ""
+              }
+            ]
+          }
+        }
+      }
+
+      assert {:reject, "[KeywordPolicy] Matches with rejected keyword"} =
+               KeywordPolicy.filter(message)
+    end
+
+    test "rejects Updates" do
+      clear_config([:mrf_keyword, :reject], ["pun"])
+
+      message = %{
+        "type" => "Update",
+        "object" => %{
+          "content" => "just a daily reminder that compLAINer is a good",
+          "summary" => "",
+          "formerRepresentations" => %{
+            "type" => "OrderedCollection",
+            "orderedItems" => [
+              %{
+                "content" => "just a daily reminder that compLAINer is a good pun",
+                "summary" => ""
+              }
+            ]
+          }
+        }
+      }
+
+      assert {:reject, "[KeywordPolicy] Matches with rejected keyword"} =
+               KeywordPolicy.filter(message)
+    end
   end
 
   describe "delisting from ftl based on keywords" do
@@ -157,6 +205,31 @@ test "delists if regex matches in summary" do
                    not (["https://www.w3.org/ns/activitystreams#Public"] == result["to"])
                end)
     end
+
+    test "delists if string matches in history" do
+      clear_config([:mrf_keyword, :federated_timeline_removal], ["pun"])
+
+      message = %{
+        "to" => ["https://www.w3.org/ns/activitystreams#Public"],
+        "type" => "Create",
+        "object" => %{
+          "content" => "just a daily reminder that compLAINer is a good",
+          "summary" => "",
+          "formerRepresentations" => %{
+            "orderedItems" => [
+              %{
+                "content" => "just a daily reminder that compLAINer is a good pun",
+                "summary" => ""
+              }
+            ]
+          }
+        }
+      }
+
+      {:ok, result} = KeywordPolicy.filter(message)
+      assert ["https://www.w3.org/ns/activitystreams#Public"] == result["cc"]
+      refute ["https://www.w3.org/ns/activitystreams#Public"] == result["to"]
+    end
   end
 
   describe "replacing keywords" do
@@ -221,5 +294,63 @@ test "replaces keyword if regex matches in summary" do
                  result == "ZFS is free software"
                end)
     end
+
+    test "replaces keyword if string matches in history" do
+      clear_config([:mrf_keyword, :replace], [{"opensource", "free software"}])
+
+      message = %{
+        "type" => "Create",
+        "to" => ["https://www.w3.org/ns/activitystreams#Public"],
+        "object" => %{
+          "content" => "ZFS is opensource",
+          "summary" => "",
+          "formerRepresentations" => %{
+            "type" => "OrderedCollection",
+            "orderedItems" => [
+              %{"content" => "ZFS is opensource mew mew", "summary" => ""}
+            ]
+          }
+        }
+      }
+
+      {:ok,
+       %{
+         "object" => %{
+           "content" => "ZFS is free software",
+           "formerRepresentations" => %{
+             "orderedItems" => [%{"content" => "ZFS is free software mew mew"}]
+           }
+         }
+       }} = KeywordPolicy.filter(message)
+    end
+
+    test "replaces keyword in Updates" do
+      clear_config([:mrf_keyword, :replace], [{"opensource", "free software"}])
+
+      message = %{
+        "type" => "Update",
+        "to" => ["https://www.w3.org/ns/activitystreams#Public"],
+        "object" => %{
+          "content" => "ZFS is opensource",
+          "summary" => "",
+          "formerRepresentations" => %{
+            "type" => "OrderedCollection",
+            "orderedItems" => [
+              %{"content" => "ZFS is opensource mew mew", "summary" => ""}
+            ]
+          }
+        }
+      }
+
+      {:ok,
+       %{
+         "object" => %{
+           "content" => "ZFS is free software",
+           "formerRepresentations" => %{
+             "orderedItems" => [%{"content" => "ZFS is free software mew mew"}]
+           }
+         }
+       }} = KeywordPolicy.filter(message)
+    end
   end
 end
diff --git a/test/pleroma/web/common_api_test.exs b/test/pleroma/web/common_api_test.exs
index e9598aea0..7d9194845 100644
--- a/test/pleroma/web/common_api_test.exs
+++ b/test/pleroma/web/common_api_test.exs
@@ -1421,5 +1421,22 @@ test "editing a post that copied a remote title with remote emoji should keep th
 
       assert edited_note.data["emoji"]["remoteemoji"] == remote_emoji_uri
     end
+
+    test "respects MRF" do
+      user = insert(:user)
+
+      clear_config([:mrf, :policies], [Pleroma.Web.ActivityPub.MRF.KeywordPolicy])
+      clear_config([:mrf_keyword, :replace], [{"updated", "mewmew"}])
+
+      {:ok, activity} = CommonAPI.post(user, %{status: "foo1", spoiler_text: "updated 1"})
+      assert Object.normalize(activity).data["summary"] == "mewmew 1"
+
+      {:ok, updated} = CommonAPI.update(user, activity, %{status: "updated 2"})
+
+      updated_object = Object.normalize(updated)
+      assert updated_object.data["content"] == "mewmew 2"
+      assert Map.get(updated_object.data, "summary", "") == ""
+      assert Map.has_key?(updated_object.data, "updated")
+    end
   end
 end
-- 
2.43.0


From 21b63172a1e2119734c741a2558bf04acc1da249 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sat, 23 Jul 2022 17:48:39 -0400
Subject: [PATCH 42/48] Make EnsureRePrepended history-aware

---
 lib/pleroma/object/updater.ex                 |  4 +-
 lib/pleroma/web/activity_pub/mrf.ex           | 45 +++++++++++++++-
 .../activity_pub/mrf/ensure_re_prepended.ex   |  6 ++-
 lib/pleroma/web/activity_pub/mrf/policy.ex    |  3 +-
 .../mrf/ensure_re_prepended_test.exs          | 51 ++++++++++++++++++-
 5 files changed, 102 insertions(+), 7 deletions(-)

diff --git a/lib/pleroma/object/updater.ex b/lib/pleroma/object/updater.ex
index 6381320bd..ab38d3ed2 100644
--- a/lib/pleroma/object/updater.ex
+++ b/lib/pleroma/object/updater.ex
@@ -198,7 +198,7 @@ def make_new_object_data_from_update_object(original_data, new_data) do
     }
   end
 
-  defp for_each_history_item(%{"orderedItems" => items} = history, _object, fun) do
+  def for_each_history_item(%{"orderedItems" => items} = history, _object, fun) do
     new_items =
       Enum.map(items, fun)
       |> Enum.reduce_while(
@@ -215,7 +215,7 @@ defp for_each_history_item(%{"orderedItems" => items} = history, _object, fun) d
     end
   end
 
-  defp for_each_history_item(history, _, _) do
+  def for_each_history_item(history, _, _) do
     {:ok, history}
   end
 
diff --git a/lib/pleroma/web/activity_pub/mrf.ex b/lib/pleroma/web/activity_pub/mrf.ex
index bd6f6777f..a0a253490 100644
--- a/lib/pleroma/web/activity_pub/mrf.ex
+++ b/lib/pleroma/web/activity_pub/mrf.ex
@@ -53,10 +53,53 @@ defmodule Pleroma.Web.ActivityPub.MRF do
 
   @required_description_keys [:key, :related_policy]
 
+  def filter_one(policy, message) do
+    should_plug_history? =
+      if function_exported?(policy, :history_awareness, 0) do
+        policy.history_awareness()
+      else
+        :manual
+      end
+      |> Kernel.==(:auto)
+
+    if not should_plug_history? do
+      policy.filter(message)
+    else
+      main_result = policy.filter(message)
+
+      with {_, {:ok, main_message}} <- {:main, main_result},
+           {_,
+            %{
+              "formerRepresentations" => %{
+                "orderedItems" => [_ | _]
+              }
+            }} = {_, object} <- {:object, message["object"]},
+           {_, {:ok, new_history}} <-
+             {:history,
+              Pleroma.Object.Updater.for_each_history_item(
+                object["formerRepresentations"],
+                object,
+                fn item ->
+                  with {:ok, filtered} <- policy.filter(Map.put(message, "object", item)) do
+                    {:ok, filtered["object"]}
+                  else
+                    e -> e
+                  end
+                end
+              )} do
+        {:ok, put_in(main_message, ["object", "formerRepresentations"], new_history)}
+      else
+        {:main, _} -> main_result
+        {:object, _} -> main_result
+        {:history, e} -> e
+      end
+    end
+  end
+
   def filter(policies, %{} = message) do
     policies
     |> Enum.reduce({:ok, message}, fn
-      policy, {:ok, message} -> policy.filter(message)
+      policy, {:ok, message} -> filter_one(policy, message)
       _, error -> error
     end)
   end
diff --git a/lib/pleroma/web/activity_pub/mrf/ensure_re_prepended.ex b/lib/pleroma/web/activity_pub/mrf/ensure_re_prepended.ex
index fad8d873b..c438b8f70 100644
--- a/lib/pleroma/web/activity_pub/mrf/ensure_re_prepended.ex
+++ b/lib/pleroma/web/activity_pub/mrf/ensure_re_prepended.ex
@@ -10,6 +10,8 @@ defmodule Pleroma.Web.ActivityPub.MRF.EnsureRePrepended do
 
   @reply_prefix Regex.compile!("^re:[[:space:]]*", [:caseless])
 
+  def history_awareness, do: :auto
+
   def filter_by_summary(
         %{data: %{"summary" => parent_summary}} = _in_reply_to,
         %{"summary" => child_summary} = child
@@ -27,8 +29,8 @@ def filter_by_summary(
 
   def filter_by_summary(_in_reply_to, child), do: child
 
-  def filter(%{"type" => "Create", "object" => child_object} = object)
-      when is_map(child_object) do
+  def filter(%{"type" => type, "object" => child_object} = object)
+      when type in ["Create", "Update"] and is_map(child_object) do
     child =
       child_object["inReplyTo"]
       |> Object.normalize(fetch: false)
diff --git a/lib/pleroma/web/activity_pub/mrf/policy.ex b/lib/pleroma/web/activity_pub/mrf/policy.ex
index a4a960c01..75209b2db 100644
--- a/lib/pleroma/web/activity_pub/mrf/policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/policy.ex
@@ -12,5 +12,6 @@ defmodule Pleroma.Web.ActivityPub.MRF.Policy do
               label: String.t(),
               description: String.t()
             }
-  @optional_callbacks config_description: 0
+  @callback history_awareness() :: :auto | :manual
+  @optional_callbacks config_description: 0, history_awareness: 0
 end
diff --git a/test/pleroma/web/activity_pub/mrf/ensure_re_prepended_test.exs b/test/pleroma/web/activity_pub/mrf/ensure_re_prepended_test.exs
index 89439b65f..e174a83f7 100644
--- a/test/pleroma/web/activity_pub/mrf/ensure_re_prepended_test.exs
+++ b/test/pleroma/web/activity_pub/mrf/ensure_re_prepended_test.exs
@@ -7,6 +7,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.EnsureRePrependedTest do
 
   alias Pleroma.Activity
   alias Pleroma.Object
+  alias Pleroma.Web.ActivityPub.MRF
   alias Pleroma.Web.ActivityPub.MRF.EnsureRePrepended
 
   describe "rewrites summary" do
@@ -35,10 +36,58 @@ test "it adds `re:` to summary object when child summary containts re-subject of
       assert {:ok, res} = EnsureRePrepended.filter(message)
       assert res["object"]["summary"] == "re: object-summary"
     end
+
+    test "it adds `re:` to history" do
+      message = %{
+        "type" => "Create",
+        "object" => %{
+          "summary" => "object-summary",
+          "inReplyTo" => %Activity{object: %Object{data: %{"summary" => "object-summary"}}},
+          "formerRepresentations" => %{
+            "orderedItems" => [
+              %{
+                "summary" => "object-summary",
+                "inReplyTo" => %Activity{object: %Object{data: %{"summary" => "object-summary"}}}
+              }
+            ]
+          }
+        }
+      }
+
+      assert {:ok, res} = MRF.filter_one(EnsureRePrepended, message)
+      assert res["object"]["summary"] == "re: object-summary"
+
+      assert Enum.at(res["object"]["formerRepresentations"]["orderedItems"], 0)["summary"] ==
+               "re: object-summary"
+    end
+
+    test "it accepts Updates" do
+      message = %{
+        "type" => "Update",
+        "object" => %{
+          "summary" => "object-summary",
+          "inReplyTo" => %Activity{object: %Object{data: %{"summary" => "object-summary"}}},
+          "formerRepresentations" => %{
+            "orderedItems" => [
+              %{
+                "summary" => "object-summary",
+                "inReplyTo" => %Activity{object: %Object{data: %{"summary" => "object-summary"}}}
+              }
+            ]
+          }
+        }
+      }
+
+      assert {:ok, res} = MRF.filter_one(EnsureRePrepended, message)
+      assert res["object"]["summary"] == "re: object-summary"
+
+      assert Enum.at(res["object"]["formerRepresentations"]["orderedItems"], 0)["summary"] ==
+               "re: object-summary"
+    end
   end
 
   describe "skip filter" do
-    test "it skip if type isn't 'Create'" do
+    test "it skip if type isn't 'Create' or 'Update'" do
       message = %{
         "type" => "Annotation",
         "object" => %{"summary" => "object-summary"}
-- 
2.43.0


From 0e9561ed515010a603069e8a38709cc8081d7e3a Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sat, 23 Jul 2022 22:34:03 -0400
Subject: [PATCH 43/48] Make MediaProxyWarmingPolicy history-aware

---
 .../mrf/media_proxy_warming_policy.ex         |  9 ++--
 .../mrf/media_proxy_warming_policy_test.exs   | 44 +++++++++++++++++++
 2 files changed, 49 insertions(+), 4 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/mrf/media_proxy_warming_policy.ex b/lib/pleroma/web/activity_pub/mrf/media_proxy_warming_policy.ex
index f60a76adf..72455afd0 100644
--- a/lib/pleroma/web/activity_pub/mrf/media_proxy_warming_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/media_proxy_warming_policy.ex
@@ -15,6 +15,9 @@ defmodule Pleroma.Web.ActivityPub.MRF.MediaProxyWarmingPolicy do
     recv_timeout: 10_000
   ]
 
+  @impl true
+  def history_awareness, do: :auto
+
   defp prefetch(url) do
     # Fetching only proxiable resources
     if MediaProxy.enabled?() and MediaProxy.url_proxiable?(url) do
@@ -53,10 +56,8 @@ defp preload(%{"object" => %{"attachment" => attachments}} = _message) do
   end
 
   @impl true
-  def filter(
-        %{"type" => "Create", "object" => %{"attachment" => attachments} = _object} = message
-      )
-      when is_list(attachments) and length(attachments) > 0 do
+  def filter(%{"type" => type, "object" => %{"attachment" => attachments} = _object} = message)
+      when type in ["Create", "Update"] and is_list(attachments) and length(attachments) > 0 do
     preload(message)
 
     {:ok, message}
diff --git a/test/pleroma/web/activity_pub/mrf/media_proxy_warming_policy_test.exs b/test/pleroma/web/activity_pub/mrf/media_proxy_warming_policy_test.exs
index 96e715d0d..3268e2321 100644
--- a/test/pleroma/web/activity_pub/mrf/media_proxy_warming_policy_test.exs
+++ b/test/pleroma/web/activity_pub/mrf/media_proxy_warming_policy_test.exs
@@ -7,6 +7,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.MediaProxyWarmingPolicyTest do
   use Pleroma.Tests.Helpers
 
   alias Pleroma.HTTP
+  alias Pleroma.Web.ActivityPub.MRF
   alias Pleroma.Web.ActivityPub.MRF.MediaProxyWarmingPolicy
 
   import Mock
@@ -22,6 +23,25 @@ defmodule Pleroma.Web.ActivityPub.MRF.MediaProxyWarmingPolicyTest do
     }
   }
 
+  @message_with_history %{
+    "type" => "Create",
+    "object" => %{
+      "type" => "Note",
+      "content" => "content",
+      "formerRepresentations" => %{
+        "orderedItems" => [
+          %{
+            "type" => "Note",
+            "content" => "content",
+            "attachment" => [
+              %{"url" => [%{"href" => "http://example.com/image.jpg"}]}
+            ]
+          }
+        ]
+      }
+    }
+  }
+
   setup do: clear_config([:media_proxy, :enabled], true)
 
   test "it prefetches media proxy URIs" do
@@ -50,4 +70,28 @@ test "it does nothing when no attachments are present" do
       refute called(HTTP.get(:_, :_, :_))
     end
   end
+
+  test "history-aware" do
+    Tesla.Mock.mock(fn %{method: :get, url: "http://example.com/image.jpg"} ->
+      {:ok, %Tesla.Env{status: 200, body: ""}}
+    end)
+
+    with_mock HTTP, get: fn _, _, _ -> {:ok, []} end do
+      MRF.filter_one(MediaProxyWarmingPolicy, @message_with_history)
+
+      assert called(HTTP.get(:_, :_, :_))
+    end
+  end
+
+  test "works with Updates" do
+    Tesla.Mock.mock(fn %{method: :get, url: "http://example.com/image.jpg"} ->
+      {:ok, %Tesla.Env{status: 200, body: ""}}
+    end)
+
+    with_mock HTTP, get: fn _, _, _ -> {:ok, []} end do
+      MRF.filter_one(MediaProxyWarmingPolicy, @message_with_history |> Map.put("type", "Update"))
+
+      assert called(HTTP.get(:_, :_, :_))
+    end
+  end
 end
-- 
2.43.0


From 314804a5a023f518b9a32485e408ee27798200c9 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sat, 23 Jul 2022 22:41:04 -0400
Subject: [PATCH 44/48] Make NoPlaceholderTextPolicy history-aware

---
 .../mrf/no_placeholder_text_policy.ex         |  7 +++-
 .../mrf/no_placeholder_text_policy_test.exs   | 41 +++++++++++++++++++
 2 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/mrf/no_placeholder_text_policy.ex b/lib/pleroma/web/activity_pub/mrf/no_placeholder_text_policy.ex
index 90272766c..f25bb4efd 100644
--- a/lib/pleroma/web/activity_pub/mrf/no_placeholder_text_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/no_placeholder_text_policy.ex
@@ -6,14 +6,17 @@ defmodule Pleroma.Web.ActivityPub.MRF.NoPlaceholderTextPolicy do
   @moduledoc "Ensure no content placeholder is present (such as the dot from mastodon)"
   @behaviour Pleroma.Web.ActivityPub.MRF.Policy
 
+  @impl true
+  def history_awareness, do: :auto
+
   @impl true
   def filter(
         %{
-          "type" => "Create",
+          "type" => type,
           "object" => %{"content" => content, "attachment" => _} = _child_object
         } = object
       )
-      when content in [".", "<p>.</p>"] do
+      when type in ["Create", "Update"] and content in [".", "<p>.</p>"] do
     {:ok, put_in(object, ["object", "content"], "")}
   end
 
diff --git a/test/pleroma/web/activity_pub/mrf/no_placeholder_text_policy_test.exs b/test/pleroma/web/activity_pub/mrf/no_placeholder_text_policy_test.exs
index 81a6e0f50..59456d790 100644
--- a/test/pleroma/web/activity_pub/mrf/no_placeholder_text_policy_test.exs
+++ b/test/pleroma/web/activity_pub/mrf/no_placeholder_text_policy_test.exs
@@ -4,6 +4,7 @@
 
 defmodule Pleroma.Web.ActivityPub.MRF.NoPlaceholderTextPolicyTest do
   use Pleroma.DataCase, async: true
+  alias Pleroma.Web.ActivityPub.MRF
   alias Pleroma.Web.ActivityPub.MRF.NoPlaceholderTextPolicy
 
   test "it clears content object" do
@@ -20,6 +21,46 @@ test "it clears content object" do
     assert res["object"]["content"] == ""
   end
 
+  test "history-aware" do
+    message = %{
+      "type" => "Create",
+      "object" => %{
+        "content" => ".",
+        "attachment" => "image",
+        "formerRepresentations" => %{
+          "orderedItems" => [%{"content" => ".", "attachment" => "image"}]
+        }
+      }
+    }
+
+    assert {:ok, res} = MRF.filter_one(NoPlaceholderTextPolicy, message)
+
+    assert %{
+             "content" => "",
+             "formerRepresentations" => %{"orderedItems" => [%{"content" => ""}]}
+           } = res["object"]
+  end
+
+  test "works with Updates" do
+    message = %{
+      "type" => "Update",
+      "object" => %{
+        "content" => ".",
+        "attachment" => "image",
+        "formerRepresentations" => %{
+          "orderedItems" => [%{"content" => ".", "attachment" => "image"}]
+        }
+      }
+    }
+
+    assert {:ok, res} = MRF.filter_one(NoPlaceholderTextPolicy, message)
+
+    assert %{
+             "content" => "",
+             "formerRepresentations" => %{"orderedItems" => [%{"content" => ""}]}
+           } = res["object"]
+  end
+
   @messages [
     %{
       "type" => "Create",
-- 
2.43.0


From 6283fd9fa7e3f281e6ec759172966fb93c55fe14 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sat, 23 Jul 2022 22:50:38 -0400
Subject: [PATCH 45/48] Make NormalizeMarkup history-aware

---
 .../web/activity_pub/mrf/normalize_markup.ex  |  6 +-
 .../mrf/normalize_markup_test.exs             | 59 +++++++++++++++----
 2 files changed, 52 insertions(+), 13 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/mrf/normalize_markup.ex b/lib/pleroma/web/activity_pub/mrf/normalize_markup.ex
index 0d7146738..151c6ed20 100644
--- a/lib/pleroma/web/activity_pub/mrf/normalize_markup.ex
+++ b/lib/pleroma/web/activity_pub/mrf/normalize_markup.ex
@@ -9,7 +9,11 @@ defmodule Pleroma.Web.ActivityPub.MRF.NormalizeMarkup do
   @behaviour Pleroma.Web.ActivityPub.MRF.Policy
 
   @impl true
-  def filter(%{"type" => "Create", "object" => child_object} = object) do
+  def history_awareness, do: :auto
+
+  @impl true
+  def filter(%{"type" => type, "object" => child_object} = object)
+      when type in ["Create", "Update"] do
     scrub_policy = Pleroma.Config.get([:mrf_normalize_markup, :scrub_policy])
 
     content =
diff --git a/test/pleroma/web/activity_pub/mrf/normalize_markup_test.exs b/test/pleroma/web/activity_pub/mrf/normalize_markup_test.exs
index edc330b6c..52a23fdca 100644
--- a/test/pleroma/web/activity_pub/mrf/normalize_markup_test.exs
+++ b/test/pleroma/web/activity_pub/mrf/normalize_markup_test.exs
@@ -4,6 +4,7 @@
 
 defmodule Pleroma.Web.ActivityPub.MRF.NormalizeMarkupTest do
   use Pleroma.DataCase, async: true
+  alias Pleroma.Web.ActivityPub.MRF
   alias Pleroma.Web.ActivityPub.MRF.NormalizeMarkup
 
   @html_sample """
@@ -16,24 +17,58 @@ defmodule Pleroma.Web.ActivityPub.MRF.NormalizeMarkupTest do
   <script>alert('hacked')</script>
   """
 
-  test "it filter html tags" do
-    expected = """
-    <b>this is in bold</b>
-    <p>this is a paragraph</p>
-    this is a linebreak<br/>
-    this is a link with allowed &quot;rel&quot; attribute: <a href="http://example.com/" rel="tag">example.com</a>
-    this is a link with not allowed &quot;rel&quot; attribute: <a href="http://example.com/">example.com</a>
-    this is an image: <img src="http://example.com/image.jpg"/><br/>
-    alert(&#39;hacked&#39;)
-    """
+  @expected """
+  <b>this is in bold</b>
+  <p>this is a paragraph</p>
+  this is a linebreak<br/>
+  this is a link with allowed &quot;rel&quot; attribute: <a href="http://example.com/" rel="tag">example.com</a>
+  this is a link with not allowed &quot;rel&quot; attribute: <a href="http://example.com/">example.com</a>
+  this is an image: <img src="http://example.com/image.jpg"/><br/>
+  alert(&#39;hacked&#39;)
+  """
 
+  test "it filter html tags" do
     message = %{"type" => "Create", "object" => %{"content" => @html_sample}}
 
     assert {:ok, res} = NormalizeMarkup.filter(message)
-    assert res["object"]["content"] == expected
+    assert res["object"]["content"] == @expected
   end
 
-  test "it skips filter if type isn't `Create`" do
+  test "history-aware" do
+    message = %{
+      "type" => "Create",
+      "object" => %{
+        "content" => @html_sample,
+        "formerRepresentations" => %{"orderedItems" => [%{"content" => @html_sample}]}
+      }
+    }
+
+    assert {:ok, res} = MRF.filter_one(NormalizeMarkup, message)
+
+    assert %{
+             "content" => @expected,
+             "formerRepresentations" => %{"orderedItems" => [%{"content" => @expected}]}
+           } = res["object"]
+  end
+
+  test "works with Updates" do
+    message = %{
+      "type" => "Update",
+      "object" => %{
+        "content" => @html_sample,
+        "formerRepresentations" => %{"orderedItems" => [%{"content" => @html_sample}]}
+      }
+    }
+
+    assert {:ok, res} = MRF.filter_one(NormalizeMarkup, message)
+
+    assert %{
+             "content" => @expected,
+             "formerRepresentations" => %{"orderedItems" => [%{"content" => @expected}]}
+           } = res["object"]
+  end
+
+  test "it skips filter if type isn't `Create` or `Update`" do
     message = %{"type" => "Note", "object" => %{}}
 
     assert {:ok, res} = NormalizeMarkup.filter(message)
-- 
2.43.0


From 0d1f3212d95ac2a968d87dda56a78e27fb3d0cc2 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sun, 24 Jul 2022 00:02:39 -0400
Subject: [PATCH 46/48] Make HashtagPolicy history-aware

---
 .../web/activity_pub/mrf/hashtag_policy.ex    | 47 ++++++++++---
 .../activity_pub/mrf/hashtag_policy_test.exs  | 70 +++++++++++++++++++
 2 files changed, 107 insertions(+), 10 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/mrf/hashtag_policy.ex b/lib/pleroma/web/activity_pub/mrf/hashtag_policy.ex
index b7db4fa3d..b5ad8b5b4 100644
--- a/lib/pleroma/web/activity_pub/mrf/hashtag_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/hashtag_policy.ex
@@ -16,6 +16,9 @@ defmodule Pleroma.Web.ActivityPub.MRF.HashtagPolicy do
 
   @behaviour Pleroma.Web.ActivityPub.MRF.Policy
 
+  @impl true
+  def history_awareness, do: :manual
+
   defp check_reject(message, hashtags) do
     if Enum.any?(Config.get([:mrf_hashtag, :reject]), fn match -> match in hashtags end) do
       {:reject, "[HashtagPolicy] Matches with rejected keyword"}
@@ -47,22 +50,46 @@ defp check_ftl_removal(%{"to" => to} = message, hashtags) do
 
   defp check_ftl_removal(message, _hashtags), do: {:ok, message}
 
-  defp check_sensitive(message, hashtags) do
-    if Enum.any?(Config.get([:mrf_hashtag, :sensitive]), fn match -> match in hashtags end) do
-      {:ok, Kernel.put_in(message, ["object", "sensitive"], true)}
-    else
-      {:ok, message}
-    end
+  defp check_sensitive(message) do
+    {:ok, new_object} =
+      Object.Updater.do_with_history(message["object"], fn object ->
+        hashtags = Object.hashtags(%Object{data: object})
+
+        if Enum.any?(Config.get([:mrf_hashtag, :sensitive]), fn match -> match in hashtags end) do
+          {:ok, Map.put(object, "sensitive", true)}
+        else
+          {:ok, object}
+        end
+      end)
+
+    {:ok, Map.put(message, "object", new_object)}
   end
 
   @impl true
-  def filter(%{"type" => "Create", "object" => object} = message) do
-    hashtags = Object.hashtags(%Object{data: object})
+  def filter(%{"type" => type, "object" => object} = message) when type in ["Create", "Update"] do
+    history_items =
+      with %{"formerRepresentations" => %{"orderedItems" => items}} <- object do
+        items
+      else
+        _ -> []
+      end
+
+    historical_hashtags =
+      Enum.reduce(history_items, [], fn item, acc ->
+        acc ++ Object.hashtags(%Object{data: item})
+      end)
+
+    hashtags = Object.hashtags(%Object{data: object}) ++ historical_hashtags
 
     if hashtags != [] do
       with {:ok, message} <- check_reject(message, hashtags),
-           {:ok, message} <- check_ftl_removal(message, hashtags),
-           {:ok, message} <- check_sensitive(message, hashtags) do
+           {:ok, message} <-
+             (if "type" == "Create" do
+                check_ftl_removal(message, hashtags)
+              else
+                {:ok, message}
+              end),
+           {:ok, message} <- check_sensitive(message) do
         {:ok, message}
       end
     else
diff --git a/test/pleroma/web/activity_pub/mrf/hashtag_policy_test.exs b/test/pleroma/web/activity_pub/mrf/hashtag_policy_test.exs
index 13415bb79..b88090869 100644
--- a/test/pleroma/web/activity_pub/mrf/hashtag_policy_test.exs
+++ b/test/pleroma/web/activity_pub/mrf/hashtag_policy_test.exs
@@ -20,6 +20,76 @@ test "it sets the sensitive property with relevant hashtags" do
     assert modified["object"]["sensitive"]
   end
 
+  test "it is history-aware" do
+    activity = %{
+      "type" => "Create",
+      "object" => %{
+        "content" => "hey",
+        "tag" => []
+      }
+    }
+
+    activity_data =
+      activity
+      |> put_in(
+        ["object", "formerRepresentations"],
+        %{
+          "type" => "OrderedCollection",
+          "orderedItems" => [
+            Map.put(
+              activity["object"],
+              "tag",
+              [%{"type" => "Hashtag", "name" => "#nsfw"}]
+            )
+          ]
+        }
+      )
+
+    {:ok, modified} =
+      Pleroma.Web.ActivityPub.MRF.filter_one(
+        Pleroma.Web.ActivityPub.MRF.HashtagPolicy,
+        activity_data
+      )
+
+    refute modified["object"]["sensitive"]
+    assert Enum.at(modified["object"]["formerRepresentations"]["orderedItems"], 0)["sensitive"]
+  end
+
+  test "it works with Update" do
+    activity = %{
+      "type" => "Update",
+      "object" => %{
+        "content" => "hey",
+        "tag" => []
+      }
+    }
+
+    activity_data =
+      activity
+      |> put_in(
+        ["object", "formerRepresentations"],
+        %{
+          "type" => "OrderedCollection",
+          "orderedItems" => [
+            Map.put(
+              activity["object"],
+              "tag",
+              [%{"type" => "Hashtag", "name" => "#nsfw"}]
+            )
+          ]
+        }
+      )
+
+    {:ok, modified} =
+      Pleroma.Web.ActivityPub.MRF.filter_one(
+        Pleroma.Web.ActivityPub.MRF.HashtagPolicy,
+        activity_data
+      )
+
+    refute modified["object"]["sensitive"]
+    assert Enum.at(modified["object"]["formerRepresentations"]["orderedItems"], 0)["sensitive"]
+  end
+
   test "it doesn't sets the sensitive property with irrelevant hashtags" do
     user = insert(:user)
 
-- 
2.43.0


From 1dfbf9edb69b55cac79a8b003b918cfa79f14c01 Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sun, 24 Jul 2022 00:18:09 -0400
Subject: [PATCH 47/48] Make AntiLinkSpamPolicy history-aware

---
 .../activity_pub/mrf/anti_link_spam_policy.ex |  3 ++
 .../mrf/anti_link_spam_policy_test.exs        | 33 ++++++++++++++++---
 2 files changed, 32 insertions(+), 4 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/mrf/anti_link_spam_policy.ex b/lib/pleroma/web/activity_pub/mrf/anti_link_spam_policy.ex
index cdf17fd28..ba7c8400b 100644
--- a/lib/pleroma/web/activity_pub/mrf/anti_link_spam_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/anti_link_spam_policy.ex
@@ -9,6 +9,9 @@ defmodule Pleroma.Web.ActivityPub.MRF.AntiLinkSpamPolicy do
 
   require Logger
 
+  @impl true
+  def history_awareness, do: :auto
+
   # has the user successfully posted before?
   defp old_user?(%User{} = u) do
     u.note_count > 0 || u.follower_count > 0
diff --git a/test/pleroma/web/activity_pub/mrf/anti_link_spam_policy_test.exs b/test/pleroma/web/activity_pub/mrf/anti_link_spam_policy_test.exs
index 5b990451c..c3ee03a05 100644
--- a/test/pleroma/web/activity_pub/mrf/anti_link_spam_policy_test.exs
+++ b/test/pleroma/web/activity_pub/mrf/anti_link_spam_policy_test.exs
@@ -7,6 +7,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.AntiLinkSpamPolicyTest do
   import Pleroma.Factory
   import ExUnit.CaptureLog
 
+  alias Pleroma.Web.ActivityPub.MRF
   alias Pleroma.Web.ActivityPub.MRF.AntiLinkSpamPolicy
 
   @linkless_message %{
@@ -49,11 +50,23 @@ test "it disallows posts with links" do
 
       assert user.note_count == 0
 
-      message =
-        @linkful_message
-        |> Map.put("actor", user.ap_id)
+      message = %{
+        "type" => "Create",
+        "actor" => user.ap_id,
+        "object" => %{
+          "formerRepresentations" => %{
+            "type" => "OrderedCollection",
+            "orderedItems" => [
+              %{
+                "content" => "<a href='https://example.com'>hi world!</a>"
+              }
+            ]
+          },
+          "content" => "mew"
+        }
+      }
 
-      {:reject, _} = AntiLinkSpamPolicy.filter(message)
+      {:reject, _} = MRF.filter_one(AntiLinkSpamPolicy, message)
     end
 
     test "it allows posts with links for local users" do
@@ -67,6 +80,18 @@ test "it allows posts with links for local users" do
 
       {:ok, _message} = AntiLinkSpamPolicy.filter(message)
     end
+
+    test "it disallows posts with links in history" do
+      user = insert(:user, local: false)
+
+      assert user.note_count == 0
+
+      message =
+        @linkful_message
+        |> Map.put("actor", user.ap_id)
+
+      {:reject, _} = AntiLinkSpamPolicy.filter(message)
+    end
   end
 
   describe "with old user" do
-- 
2.43.0


From 32baa9b9f093e74cbd58df7cfcf9a45105394cab Mon Sep 17 00:00:00 2001
From: Tusooa Zhu <tusooa@kazv.moe>
Date: Sat, 23 Jul 2022 23:24:25 -0400
Subject: [PATCH 48/48] Make NoEmptyPolicy work with Update

---
 .../web/activity_pub/mrf/no_empty_policy.ex   | 29 +++++++------------
 lib/pleroma/web/common_api/activity_draft.ex  |  1 -
 .../activity_pub/mrf/no_empty_policy_test.exs | 23 +++++++++++++++
 .../controllers/status_controller_test.exs    |  2 +-
 4 files changed, 35 insertions(+), 20 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/mrf/no_empty_policy.ex b/lib/pleroma/web/activity_pub/mrf/no_empty_policy.ex
index b2939a4d6..19637a38d 100644
--- a/lib/pleroma/web/activity_pub/mrf/no_empty_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/no_empty_policy.ex
@@ -11,6 +11,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.NoEmptyPolicy do
   @impl true
   def filter(%{"actor" => actor} = object) do
     with true <- is_local?(actor),
+         true <- is_eligible_type?(object),
          true <- is_note?(object),
          false <- has_attachment?(object),
          true <- only_mentions?(object) do
@@ -32,7 +33,6 @@ defp is_local?(actor) do
   end
 
   defp has_attachment?(%{
-         "type" => "Create",
          "object" => %{"type" => "Note", "attachment" => attachments}
        })
        when length(attachments) > 0,
@@ -40,23 +40,13 @@ defp has_attachment?(%{
 
   defp has_attachment?(_), do: false
 
-  defp only_mentions?(%{"type" => "Create", "object" => %{"type" => "Note", "source" => source}})
-       when is_binary(source) do
-    non_mentions =
-      source |> String.split() |> Enum.filter(&(not String.starts_with?(&1, "@"))) |> length
+  defp only_mentions?(%{"object" => %{"type" => "Note", "source" => source}}) do
+    source =
+      case source do
+        %{"content" => text} -> text
+        _ -> source
+      end
 
-    if non_mentions > 0 do
-      false
-    else
-      true
-    end
-  end
-
-  defp only_mentions?(%{
-         "type" => "Create",
-         "object" => %{"type" => "Note", "source" => %{"content" => source}}
-       })
-       when is_binary(source) do
     non_mentions =
       source |> String.split() |> Enum.filter(&(not String.starts_with?(&1, "@"))) |> length
 
@@ -69,9 +59,12 @@ defp only_mentions?(%{
 
   defp only_mentions?(_), do: false
 
-  defp is_note?(%{"type" => "Create", "object" => %{"type" => "Note"}}), do: true
+  defp is_note?(%{"object" => %{"type" => "Note"}}), do: true
   defp is_note?(_), do: false
 
+  defp is_eligible_type?(%{"type" => type}) when type in ["Create", "Update"], do: true
+  defp is_eligible_type?(_), do: false
+
   @impl true
   def describe, do: {:ok, %{}}
 end
diff --git a/lib/pleroma/web/common_api/activity_draft.ex b/lib/pleroma/web/common_api/activity_draft.ex
index a672fc2e5..b3a49de44 100644
--- a/lib/pleroma/web/common_api/activity_draft.ex
+++ b/lib/pleroma/web/common_api/activity_draft.ex
@@ -221,7 +221,6 @@ defp object(draft) do
       |> Map.put("emoji", emoji)
       |> Map.put("source", %{
         "content" => draft.status,
-        "mediaType" => draft.params[:content_type]
         "mediaType" => Utils.get_content_type(draft.params[:content_type])
       })
       |> Map.put("generator", draft.params[:generator])
diff --git a/test/pleroma/web/activity_pub/mrf/no_empty_policy_test.exs b/test/pleroma/web/activity_pub/mrf/no_empty_policy_test.exs
index 2c6fcbc41..d9e05d313 100644
--- a/test/pleroma/web/activity_pub/mrf/no_empty_policy_test.exs
+++ b/test/pleroma/web/activity_pub/mrf/no_empty_policy_test.exs
@@ -153,4 +153,27 @@ test "Notes with no content are denied" do
 
     assert NoEmptyPolicy.filter(message) == {:reject, "[NoEmptyPolicy]"}
   end
+
+  test "works with Update" do
+    message = %{
+      "actor" => "http://localhost:4001/users/testuser",
+      "cc" => ["http://localhost:4001/users/testuser/followers"],
+      "object" => %{
+        "actor" => "http://localhost:4001/users/testuser",
+        "attachment" => [],
+        "cc" => ["http://localhost:4001/users/testuser/followers"],
+        "source" => "",
+        "to" => [
+          "https://www.w3.org/ns/activitystreams#Public"
+        ],
+        "type" => "Note"
+      },
+      "to" => [
+        "https://www.w3.org/ns/activitystreams#Public"
+      ],
+      "type" => "Update"
+    }
+
+    assert NoEmptyPolicy.filter(message) == {:reject, "[NoEmptyPolicy]"}
+  end
 end
diff --git a/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs b/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
index 2cee46cb3..4973c8023 100644
--- a/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
+++ b/test/pleroma/web/mastodon_api/controllers/status_controller_test.exs
@@ -2040,7 +2040,7 @@ test "posting a quote of a status that doesn't exist", %{conn: conn} do
                  "quote_id" => "oops"
                })
                |> json_response_and_validate_schema(422)
-	end
+    end
   end
 
   describe "get status history" do
-- 
2.43.0